Adler Planetarium & Astronomy Museum
Interprets the exploration of the Universe for the broadest possible audience and hosts one of the finest collections of early astronomical instruments in the world.
http://www.adlerplanetarium.org/
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Digital Archive of Historical Astronomy Pictures
The pictures are provided in two formats. Grayscale pictures are saved in jpg-format, whereas drawings and engravings are saved in gif- format, as it seems that jpg-files must be in 256 colours. Saving the linedrawings as gifs allows them to be saved in 2
http://www.kunskapsbolaget.com/DAHAP/
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Shapley
Curtis Debate in 1920 guide to understanding all facets of the Great Debate between Harlow Shapley and Heber D. Curtis over the scale of the universe. Includes a complete transcript.
http://antwrp.gsfc.nasa.gov/diamond_jubilee/debate_1920.html
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