0321988833 / 9780321988836 Astronomy Today Volume 2: Stars and Galaxies & MasteringAstronomy with Pearson eText -- ValuePack Access Card -- for Astronomy Today Package
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0321909720 / 9780321909725 Astronomy Today Volume 2: Stars and Galaxies
0321909860 / 9780321909862 MasteringAstronomy with Pearson eText -- ValuePack Access Card -- for Astronomy Today