diff --git a/Conjuga/Conjuga/Services/DataLoader.swift b/Conjuga/Conjuga/Services/DataLoader.swift
index 10bbbd4..f2db7c2 100644
--- a/Conjuga/Conjuga/Services/DataLoader.swift
+++ b/Conjuga/Conjuga/Services/DataLoader.swift
@@ -9,7 +9,7 @@ actor DataLoader {
     static let textbookDataVersion = 14
     static let textbookDataKey = "textbookDataVersion"
 
-    static let bookDataVersion = 2  // bump: vocab <li> bullets now extracted
+    static let bookDataVersion = 3  // bump: robust bundle lookup with explicit-slug fallback
     static let bookDataKey = "bookDataVersion"
 
     /// Quick check: does the DB need seeding or course data refresh?
@@ -163,7 +163,10 @@ actor DataLoader {
         let shared = UserDefaults.standard
         let context = ModelContext(container)
         let existingCount = (try? context.fetchCount(FetchDescriptor<Book>())) ?? 0
-        let versionCurrent = shared.integer(forKey: bookDataKey) >= bookDataVersion
+        let storedVersion = shared.integer(forKey: bookDataKey)
+        let versionCurrent = storedVersion >= bookDataVersion
+
+        print("[DataLoader] refreshBooksDataIfNeeded: existing=\(existingCount) stored=\(storedVersion) target=\(bookDataVersion) versionCurrent=\(versionCurrent)")
 
         if versionCurrent && existingCount > 0 { return }
 
@@ -182,7 +185,9 @@ actor DataLoader {
 
         if seedBooks(context: context) {
             shared.set(bookDataVersion, forKey: bookDataKey)
-            print("Book data re-seeded to version \(bookDataVersion)")
+            print("[DataLoader] Book data re-seeded to version \(bookDataVersion)")
+        } else {
+            print("[DataLoader] Book reseed produced no rows — leaving version key untouched")
         }
     }
 
@@ -637,18 +642,45 @@ actor DataLoader {
         return true
     }
 
-    /// Find every `book_*.json` resource in the app bundle.
+    /// Slugs of books bundled with the app. Kept explicit so device installs
+    /// don't depend on `Bundle.urls(forResourcesWithExtension:subdirectory:)`
+    /// successfully enumerating the bundle — that API has been observed to
+    /// return empty for some iOS configurations even when the resource is
+    /// present, matching the same `bundleURL.appendingPathComponent` fallback
+    /// used by the textbook seed.
+    private static let bundledBookSlugs: [String] = [
+        "olly-vol2",
+    ]
+
+    /// Resolve URLs for every bundled book. Uses the explicit-slug fast path
+    /// first (mirrors `seedTextbookData`'s lookup pattern), then falls back to
+    /// directory enumeration so newly-bundled books are picked up without a
+    /// code change.
     private static func bundledBookJSONURLs() -> [URL] {
         var seen = Set<String>()
         var out: [URL] = []
         let bundle = Bundle.main
-        for ext in ["json"] {
-            if let urls = bundle.urls(forResourcesWithExtension: ext, subdirectory: nil) {
-                for url in urls where url.lastPathComponent.hasPrefix("book_") {
-                    if seen.insert(url.lastPathComponent).inserted { out.append(url) }
+
+        for slug in bundledBookSlugs {
+            let filename = "book_\(slug).json"
+            let url = bundle.url(forResource: "book_\(slug)", withExtension: "json")
+                ?? bundle.bundleURL.appendingPathComponent(filename)
+            if FileManager.default.fileExists(atPath: url.path),
+               seen.insert(filename).inserted {
+                out.append(url)
+            }
+        }
+
+        if let urls = bundle.urls(forResourcesWithExtension: "json", subdirectory: nil) {
+            for url in urls where url.lastPathComponent.hasPrefix("book_") {
+                if seen.insert(url.lastPathComponent).inserted {
+                    out.append(url)
                 }
             }
         }
+
+        let names = out.map(\.lastPathComponent).joined(separator: ", ")
+        print("[DataLoader] bundledBookJSONURLs found \(out.count) files: [\(names)]")
         return out.sorted { $0.lastPathComponent < $1.lastPathComponent }
     }