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astronomy
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Alexander von Humboldt
astronomy
4.0
Supplement
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astronomy
A new geographical, historical, and commercial grammar, and present state of the several kingdoms of the world ..
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astronomy
Astronomical Almanac for the Year 1993
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astronomy
1.0
Cosmos
Carl Sagan
astronomy
4.6
Baby Einstein
Julie Aigner-Clark
astronomy
3.8
21st Century Astronomy
Jeffrey S. Hester
astronomy
4.5