パッチワークキルトパターン百科事典（第3版）by Barbara Brackman

I’ve been cross-referencing patterns from old auction finds, and this edition’s expanded index finally connects them to proper sources. The updated bibliography alone saved me hours of research.

The 3rd edition’s layout is noticeably easier to navigate than older versions, and the expanded block index alone is worth the price for serious pattern research.

Finally found a copy of the updated third edition—the expanded pattern index alone is worth the price, covering so many more blocks than the older version I used before.