"...the only other official piece of licensing besides the calendars and shirt is 'Teaching with Calvin and Hobbes,' containing reprints of strips. This comes from 1993 and Watterson just barely allowed it, after he got a letter from one of the authors describing how she used Calvin to teach to children with special needs. Universal put a legal vise on the print run, restricting sales to classrooms ONLY and producing only 2,500 copies...."
http://www.platypuscomix.net/otherpeople/watterson.html
