18 November 2010 - I Hope You're Not Squeamish

"In fact, the only official Calvin and Hobbes products, besides the books, are two monthly calenders (1989 & 1990), one tee shirt created in a run of one for the MOMA, and an educational book, Teaching with Calvin and Hobbes, which is long out of print..."

http://www.ihopeyourenotsqueamish.org/2010/11/better-than-song-by-zack-attack.html