>The Gateless Barrier, sometimes translated as The Gateless Gate, is a collectio ...

The Gateless Barrier, sometimes translated as The Gateless Gate, is a collection of 48 Chan (Zen) koans compiled in the early 13th century by the Chinese Zen master Wumen Huikai.

I found this version. It only has 32 chapters:

http://www.ibiblio.org/zen/cgi-bin/koan-index.pl