diff --git a/.github/workflows/periphery.yml b/.github/workflows/periphery.yml
new file mode 100644
index 00000000..5b2910f9
--- /dev/null
+++ b/.github/workflows/periphery.yml
@@ -0,0 +1,18 @@
+name: Periphery
+on:
+  push:
+    branches: [master]
+  pull_request:
+jobs:
+  periphery:
+    name: Run Periphery
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: SwiftyLab/setup-swift@latest
+        with:
+          swift-version: "6.2"
+      - name: Install Periphery
+        run: brew install peripheryapp/periphery/periphery
+      - name: Run Periphery
+        run: periphery scan
diff --git a/.periphery.yml b/.periphery.yml
new file mode 100644
index 00000000..85b884af
--- /dev/null
+++ b/.periphery.yml
@@ -0,0 +1 @@
+retain_public: true
diff --git a/Sources/SwiftNASR/Distribution/Distribution.swift b/Sources/SwiftNASR/Distribution/Distribution.swift
index 8a46bf7d..0899a627 100644
--- a/Sources/SwiftNASR/Distribution/Distribution.swift
+++ b/Sources/SwiftNASR/Distribution/Distribution.swift
@@ -1,29 +1,5 @@
 import Foundation
 
-private let metatypes =
-  [
-    (RecordType.states, State.self),
-    (RecordType.airports, Airport.self),
-    (RecordType.ARTCCFacilities, ARTCC.self),
-    (RecordType.reportingPoints, Fix.self),
-    (RecordType.weatherReportingStations, WeatherStation.self),
-    (RecordType.airways, Airway.self),
-    (RecordType.ILSes, ILS.self),
-    (RecordType.terminalCommFacilities, TerminalCommFacility.self),
-    (RecordType.departureArrivalProceduresComplete, DepartureArrivalProcedure.self),
-    (RecordType.preferredRoutes, PreferredRoute.self),
-    (RecordType.holds, Hold.self),
-    (RecordType.weatherReportingLocations, WeatherReportingLocation.self),
-    (RecordType.parachuteJumpAreas, ParachuteJumpArea.self),
-    (RecordType.militaryTrainingRoutes, MilitaryTrainingRoute.self),
-    (RecordType.codedDepartureRoutes, CodedDepartureRoute.self),
-    (RecordType.miscActivityAreas, MiscActivityArea.self),
-    (RecordType.ARTCCBoundarySegments, ARTCCBoundarySegment.self),
-    (RecordType.FSSCommFacilities, FSSCommFacility.self),
-    (RecordType.ATSAirways, ATSAirway.self),
-    (RecordType.locationIdentifiers, LocationIdentifier.self)
-  ] as [(RecordType, any Record.Type)]
-
 /// Record types available to load from a distribution.
 public enum RecordType: String, Codable, Sendable {
   case ARTCCFacilities = "AFF"
@@ -51,20 +27,6 @@ public enum RecordType: String, Codable, Sendable {
   /// This is a pseudo-record-type intended to represent the `STATE.txt` file.
   /// `states` is not a loadable record type.
   case states = "_ST"
-
-  var metatype: any Record.Type {
-    guard let type = metatypes.first(where: { $0.0 == self })?.1 else {
-      preconditionFailure("Unsupported type \(self)")
-    }
-    return type
-  }
-
-  static func forType(_ type: any Record.Type) -> Self {
-    guard let value = metatypes.first(where: { $0.1 == type })?.0 else {
-      preconditionFailure("Unsupported type \(type)")
-    }
-    return value
-  }
 }
 
 /// Global actor that guarantees exclusive access to the distribution file.
diff --git a/Sources/SwiftNASR/Loaders/ArchiveLoader.swift b/Sources/SwiftNASR/Loaders/ArchiveLoader.swift
index daf076a7..7d7157a8 100644
--- a/Sources/SwiftNASR/Loaders/ArchiveLoader.swift
+++ b/Sources/SwiftNASR/Loaders/ArchiveLoader.swift
@@ -12,12 +12,6 @@ public final class ArchiveLoader: Loader {
   /// The data format for the archive (.txt or .csv).
   public let format: DataFormat
 
-  private let queue = DispatchQueue(
-    label: "codes.tim.SwiftNASR.ArchiveLoader",
-    qos: .utility,
-    attributes: .concurrent
-  )
-
   /**
    Creates a loader that loads from a given location on disk.
 
diff --git a/Sources/SwiftNASR/Models/Records/Airport/Remark.swift b/Sources/SwiftNASR/Models/Records/Airport/Remark.swift
index 0bd99a20..c27ea177 100644
--- a/Sources/SwiftNASR/Models/Records/Airport/Remark.swift
+++ b/Sources/SwiftNASR/Models/Records/Airport/Remark.swift
@@ -13,18 +13,6 @@ public struct Remarks<F: RemarkField>: Record {
   /// All remarks added to the record.
   public var remarks = [Remark<F>]()
 
-  /// Remarks applied to a record as a whole.
-  var general: [String] {
-    var remarks = [String]()
-
-    for remark in self.remarks {
-      guard case .general(let content) = remark else { break }
-      remarks.append(content)
-    }
-
-    return remarks
-  }
-
   /**
    Gets the remarks for a specific field.
 
diff --git a/Sources/SwiftNASR/Parsers/CSV/CSVHeaderMap.swift b/Sources/SwiftNASR/Parsers/CSV/CSVHeaderMap.swift
index 2a839b81..55533eb5 100644
--- a/Sources/SwiftNASR/Parsers/CSV/CSVHeaderMap.swift
+++ b/Sources/SwiftNASR/Parsers/CSV/CSVHeaderMap.swift
@@ -28,13 +28,6 @@ struct CSVHeaderMap: Sendable {
 
   // MARK: - Methods
 
-  /// Check if a column exists in this CSV.
-  /// - Parameter columnName: The column name to check.
-  /// - Returns: True if the column exists.
-  func contains(_ columnName: String) -> Bool {
-    nameToIndex[columnName] != nil
-  }
-
   /// Validate that all required columns exist.
   /// - Parameter requiredColumns: Array of column names that must be present.
   /// - Throws: `CSVParserError.missingRequiredColumns` if any are missing.
@@ -45,16 +38,6 @@ struct CSVHeaderMap: Sendable {
     }
   }
 
-  /// Build an index array for transformer compatibility.
-  ///
-  /// Returns -1 for columns that don't exist, allowing transformers
-  /// to handle missing optional columns gracefully.
-  /// - Parameter columnNames: The column names to map.
-  /// - Returns: Array of indices (-1 for missing columns).
-  func indices(for columnNames: [String]) -> [Int] {
-    columnNames.map { nameToIndex[$0] ?? -1 }
-  }
-
   // MARK: - Subscripts
 
   /// Look up column index by name.
diff --git a/Sources/SwiftNASR/Parsers/CSV/CSVRow.swift b/Sources/SwiftNASR/Parsers/CSV/CSVRow.swift
index 8d03c986..2344943d 100644
--- a/Sources/SwiftNASR/Parsers/CSV/CSVRow.swift
+++ b/Sources/SwiftNASR/Parsers/CSV/CSVRow.swift
@@ -11,9 +11,6 @@ struct CSVRow: Sendable {
   /// The raw field values for this row.
   let values: [String]
 
-  /// Number of fields in this row.
-  var count: Int { values.count }
-
   // MARK: - Methods
 
   /// Access a field that should exist but may be empty.
diff --git a/Sources/SwiftNASR/Parsers/Parser.swift b/Sources/SwiftNASR/Parsers/Parser.swift
index 8d58233a..97d05fb8 100644
--- a/Sources/SwiftNASR/Parsers/Parser.swift
+++ b/Sources/SwiftNASR/Parsers/Parser.swift
@@ -45,15 +45,6 @@ final class OffsetParser: Sendable {
   }
 }
 
-extension Parser {
-  static func raw<T: RecordEnum>(_ rawValue: T.RawValue, toEnum _: T.Type) throws -> T {
-    guard let val = T.for(rawValue) else {
-      throw ParserError.unknownRecordEnumValue(rawValue)
-    }
-    return val
-  }
-}
-
 enum ParserError: Swift.Error, CustomStringConvertible {
   case badData(_ reason: String)
   case unknownRecordIdentifier(_ recordIdentifier: String)
diff --git a/Sources/SwiftNASR/Parsers/Record Parsers/FSSParser/FSSParser.swift b/Sources/SwiftNASR/Parsers/Record Parsers/FSSParser/FSSParser.swift
index 36260d1f..067f081c 100644
--- a/Sources/SwiftNASR/Parsers/Record Parsers/FSSParser/FSSParser.swift	
+++ b/Sources/SwiftNASR/Parsers/Record Parsers/FSSParser/FSSParser.swift	
@@ -1,21 +1,5 @@
 import Foundation
 
-private var dateFormatter: DateFormatter {
-  let df = DateFormatter()
-  df.dateFormat = "dd MMM yyyy"
-  df.locale = Locale(identifier: "en_US_POSIX")
-  df.timeZone = zulu
-  return df
-}
-
-private var lastUpdatedDateFormatter: DateFormatter {
-  let df = DateFormatter()
-  df.dateFormat = "dd MMM yyyy"
-  df.locale = Locale(identifier: "en_US_POSIX")
-  df.timeZone = zulu
-  return df
-}
-
 actor FixedWidthFSSParser: FixedWidthNoRecordIDParser {
   static let type: RecordType = .flightServiceStations
   var formats = [NASRTable]()
diff --git a/Sources/SwiftNASR/Parsers/Record Parsers/NavaidParser.swift b/Sources/SwiftNASR/Parsers/Record Parsers/NavaidParser.swift
index 9445431a..237c1d01 100644
--- a/Sources/SwiftNASR/Parsers/Record Parsers/NavaidParser.swift	
+++ b/Sources/SwiftNASR/Parsers/Record Parsers/NavaidParser.swift	
@@ -421,8 +421,6 @@ actor FixedWidthNavaidParser: FixedWidthParser {
   }
 }
 
-private let classDesignatorDelimiters = CharacterSet(charactersIn: "-/")
-
 private func parseLFRLegs(_ string: String, fieldIndex: Int) throws -> [(LFRLeg.Quadrant, UInt)] {
   let scanner = Scanner(string: string)
   var legs = [(LFRLeg.Quadrant, UInt)]()
diff --git a/Sources/SwiftNASR/Support/JSONZipCoder.swift b/Sources/SwiftNASR/Support/JSONZipCoder.swift
index 359657df..3b35b20f 100644
--- a/Sources/SwiftNASR/Support/JSONZipCoder.swift
+++ b/Sources/SwiftNASR/Support/JSONZipCoder.swift
@@ -42,7 +42,6 @@ public class JSONZipDecoder: JSONDecoder, @unchecked Sendable {
 }
 
 enum JSONZipError: Swift.Error {
-  case couldntCreateArchive
   case couldntReadArchive
   case emptyArchive
   case noDistributionFile
diff --git a/Sources/SwiftNASR/Support/String+SwiftNASR.swift b/Sources/SwiftNASR/Support/String+SwiftNASR.swift
index 8594ff7b..ac8b5f5d 100644
--- a/Sources/SwiftNASR/Support/String+SwiftNASR.swift
+++ b/Sources/SwiftNASR/Support/String+SwiftNASR.swift
@@ -1,8 +1,6 @@
 import Foundation
 
 extension String {
-  var nsRange: NSRange { return NSRange(location: 0, length: count) }
-
   func partitionSlices(by length: Int) -> [Substring] {
     var startIndex = self.startIndex
     var results = [Substring]()
diff --git a/Tests/SwiftNASR_E2E/ErrorCollector.swift b/Tests/SwiftNASR_E2E/ErrorCollector.swift
index d4c4ecff..8437b4e7 100644
--- a/Tests/SwiftNASR_E2E/ErrorCollector.swift
+++ b/Tests/SwiftNASR_E2E/ErrorCollector.swift
@@ -3,10 +3,6 @@ import Foundation
 actor ErrorCollector {
   private var errors: [RecordError] = []
 
-  var errorCount: Int {
-    errors.count
-  }
-
   func record(_ error: Swift.Error, recordType: String) {
     errors.append(RecordError(recordType: recordType, error: error))
   }
diff --git a/Tests/SwiftNASR_E2E/ProgressTracker.swift b/Tests/SwiftNASR_E2E/ProgressTracker.swift
index 4b8df4ac..a0cc5ba6 100644
--- a/Tests/SwiftNASR_E2E/ProgressTracker.swift
+++ b/Tests/SwiftNASR_E2E/ProgressTracker.swift
@@ -41,7 +41,7 @@ func trackProgress(progress: ProgressTracker) -> Task<Void, Swift.Error> {
 }
 
 @MainActor
-func renderProgressBar(progress: ProgressTracker, barWidth: Int = 80) async {
+func renderProgressBar(progress: ProgressTracker) async {
   let fractionCompleted = await progress.fractionCompleted
   let currentRecordType = await progress.currentRecordType
   let percent = Int((fractionCompleted * 100).rounded())
diff --git a/Tests/SwiftNASR_E2E/ProgressWeights.swift b/Tests/SwiftNASR_E2E/ProgressWeights.swift
index 4a87d747..46904eb1 100644
--- a/Tests/SwiftNASR_E2E/ProgressWeights.swift
+++ b/Tests/SwiftNASR_E2E/ProgressWeights.swift
@@ -18,13 +18,6 @@ var CSVRecordTypes: Set<RecordType> {
   Set(recordTypeRegistry.values.filter(\.availableInCSV).map(\.recordType))
 }
 
-/// Calculates the total progress weight for a given format.
-func totalWeight(isCSV: Bool) -> Int64 {
-  let recordTypes = isCSV ? CSVRecordTypes : txtRecordTypes
-  let recordTotal = recordTypes.reduce(0) { $0 + weight(for: $1, isCSV: isCSV) }
-  return loadingWeight + recordTotal
-}
-
 /// Calculates the total progress weight for selected record types.
 func totalWeight(isCSV: Bool, selectedRecordTypes: Set<RecordType>) -> Int64 {
   let recordTotal = selectedRecordTypes.reduce(0) { $0 + weight(for: $1, isCSV: isCSV) }
diff --git a/Tests/SwiftNASR_E2E/SwiftNASR_E2E.swift b/Tests/SwiftNASR_E2E/SwiftNASR_E2E.swift
index 1b303c48..6b65529b 100644
--- a/Tests/SwiftNASR_E2E/SwiftNASR_E2E.swift
+++ b/Tests/SwiftNASR_E2E/SwiftNASR_E2E.swift
@@ -41,7 +41,6 @@ struct SwiftNASR_E2E: AsyncParsableCommand {
   }
 
   private let progress = ProgressTracker()
-  private var progressTask: Task<Void, Swift.Error>?
 
   init() {}
 
@@ -157,7 +156,7 @@ struct SwiftNASR_E2E: AsyncParsableCommand {
     }
     print("Done loading \(formatName); parsing…")
 
-    progressTask = trackProgress(progress: progress)
+    _ = trackProgress(progress: progress)
     let errorCollector = ErrorCollector()
     try await parseValues(
       nasr: nasr,