Jahren, Hope
Vintage Books, 2017
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Kingsolver, Robert W.
Pearson - Benjamin Cummings, 2006
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Strahler, Arthur N.
John Wiley & Sons, 2004
Buku Teks SO
Zbar, Paul B.
McGraw-Hill, 1983
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Gaultney, Jane F.
California, 2007
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