31 October 2015 - Twitter @education_us

"TIL Teaching with Calvin and Hobbes, one of the rarest pieces of C&H memorabilia..."

https://twitter.com/education_us/status/660599783229251588

31 October 2015 - reddit - todayilearned

"TIL Teaching with Calvin and Hobbes, one of the rarest pieces of C&H memorabilia, is held by just 8 libraries in the world - 7 in the States (with 4 being in ND) and 1 in Singapore. (en.wikipedia.org)"

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"I want to know what's in the book!"

https://www.reddit.com/r/todayilearned/comments/3r0unf/til_teaching_with_calvin_and_hobbes_one_of_the/