27 July 2012 - reddit - calvinandhobbes

"Someone is selling the rare teaching with Calvin & Hobbes book on ebay"

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"Its amazing to think the cheapest copy is 18K!"

http://www.reddit.com/r/calvinandhobbes/comments/x89b6/someone_is_selling_the_rare_teaching_with_calvin/

11 July 2012 - ellamedler

"I grew up with Calvin and Hobbes and have all the books. Though there is a book called Teaching with Calvin and Hobbes that sells for thousands. I do wish I had it."

http://ellamedler.wordpress.com/2012/07/11/spotlight-on-matthew-raup/