Bingo! I gotta have this one, since I teach it.

Of course, everyone doing categorical analysis needs to read about Fisher’s exact test:

• Fisher, R. A., "

  The Interpretation of

  Experimental

  Four-fold Tables. " Science, 94: 210-211 (1941)

The University of Adelaide has done us all a great service by establishing an online library of Fisher’s work–there’s some amazing stuff there.