Conversation so far:
What were the Baseball Abstracts?
Featuring 18 categories of statistical information that you just can't find anywhere else, presented 68 pages of in-depth statistics compiled from James's study.
When was it printed?
The Bill James Baseball Abstract beginning in 1977.

Question: What were some of the categories in it?
Self-contained rewrite: What were some of the categories in the Bill James Baseball Abstracts?