1623: 2016 Conversation Guide - explain xkcd

Explain xkcd is a wiki dedicated to explaining the webcomic xkcd. Go figure.

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History of Cartography The Renaissance Mathematicus

Conversations on Chemistry: In which the Elements of that Science are Familiarly Explained and Illustrated by Experiments - Volume 1 (Cambridge Library Collection - Physical Sciences): Marcet, Jane Haldimand: 9781108016834: : Books

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Did Shakespeare write Shakespeare?, The Globe: Shakespeare, his Contemporaries, and Context

xkcd: Converting to Metric