Knoebel, Arthur
Sheaves of algebras over boolean spaces
Springer Science, 2012
 eBooks
Taylor, Verta
Feminist frontiers
McGraw-Hill, 2009
 Buku Teks
Hoyle, Fred
Frontiers of astronomy
Harper & Brothers, 1955
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Morrison, David
Frontiers of astronomy
Saunders College, 1990
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Churchill, Winston, Sir, 1874-1965
Frontiers and wars
Harcourt, Brace & World, 1962
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