Martin Hidayat
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2010
UI - Skripsi Open
Lenin, Vladimir I.
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Buku Teks SO
edited by Russell O. and Garry D. Mckenzie
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Buku Teks
editor, Arie Poldervaart
Geological Society of America, 1963
Buku Teks SO
edited by Ronald Bailey
McGraw-Hill, 2000
Buku Teks