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by Flenley, D. C | Petty, Thomas L.
by Petty, Thomas L.
by Hodgkin, John E | Hodgkin, John E | Petty, Thomas L.
by Mitchell, Roger Sherman | Petty, Thomas L | Schwarz, Marvin I.
by Mitchell, Roger S | Petty, Thomas L.
by Casaburi, Richard | Petty, Thomas L.
by Scoggin, Charles H | Petty, Thomas L.