The Gateless Gate would be invaluable if only for the translation and commentary alone, yet it's loaded with extra material and is a fantastic resource to keep close by:
- An in-depth Introduction to the History of Zen Practice
- Lineage charts
- Japanese-to-Chinese and Chinese-to-Japanese conversion charts for personal names, place names, and names of writings
- Plus front- and back-matter from ancient and modern figures: Mumon, Shuan, Kubota Ji'un, Taizan Maezumi, Hugo Enomiya-Lasalle, and Yamada Roshi's son, Masamichi Yamada.
A wonderful inspiration for the koan practitioner, and for those with a general interest in Zen Buddhism.