Tolkien's Library: An Annotated Checklist: Second Edition Revised and Expanded

Polyominoes: Puzzles, Patterns, Problems, and Packings Revised Expanded Second Edition (Princeton Science Library)

The Letters of J.R.R. Tolkien: Revised and Expanded Edition

The Music Library: Revised and Expanded Edition

The Letters of J. R. Tolkien: Revised and Expanded edition