Collections
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NSF-IUSE Introduction to Astronomy by jafeldt (10 subjects)
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AST1001sample by tjnelson5 (10 subjects)
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my finds by Ruud1 (10 subjects)
Galaxy Zoo Talk
NSF-IUSE Introduction to Astronomy by jafeldt (10 subjects)
AST1001sample by tjnelson5 (10 subjects)
my finds by Ruud1 (10 subjects)