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Petkas, Peter J.
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Petkas, Peter J.
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Petit, Louis
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Petrarca, Francesco
Petherick, E.A.
Peterson, Rudolph Earl
Peterson, Howard Boyd
Peterson, Agnes F.
Petersen, William
Petersen, Karen
Petersen, Agnes F.
Peters, Richard Stanley
Peters, Karl
Peters, Franz
Povlov, Ivan Petrovich -- Works about
Petroleum Industry -- U.S.A. -- Bibliography
Petroleum Laws
Petroleum Mining
Petroleum Mining -- Automation
Petroleum Products
Pett de Bachaumont, Louis
Petrarca, Francesco
Petre, Edward Oswald Gabriel Turville-
Petre, William, Sir