DISCOVERING ASTRONOMY THIRD EDITION
R.ROBERT ROBBINS WILLIAM H.JEFFERYS STEPHEN J.SHAWL1981 年出版605 页ISBN：0471584371
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lrene Natividad and Susan B.Gall2004 年出版268 页ISBN：0787675989
AMERICAN GOVERNMENT 05/06 THIRTY-FIFTH EDITION
BRUCE STINEBRICKNER2006 年出版223 页ISBN：
AMERICAN GOVERNMENT 04/05 THIRTY-FOURTH EDITION
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AMERICAN POLITICS:THE ENDURING CONSTITUTION SECOND EDITION
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