Conversation so far:
What were The Bill James Baseball Abstracts?
The Bill James Historical Baseball Abstract is a reference-type book written by Bill James featuring an overview of professional baseball, along with rankings of the top players.
When was The Bill James Baseball Abstracts printed?
Bill James began self-publishing an annual book titled The Bill James Baseball Abstract beginning in 1977.
What were some of the categories in The Bill James Baseball Abstracts?
Some of the categories in The Bill James Baseball Abstract are runs created, defensive efficiency rating, win shares, and temperature gauge.

Question: how many copies have been sold?
Self-contained rewrite: How many copies of the The Bill James Baseball Abstracts have been sold?