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1gan Frisken, James G
Cyhoeddwyd 1992
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2gan Spencer, Robert F
Cyhoeddwyd 1959
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3gan Spencer, Robert F
Cyhoeddwyd 1969
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5gan Himmelheber, Hans, 1908-, Himmelheber, Hans, 1908-2003, Himmelheber, Hans, 1908-2003
Cyhoeddwyd 1993
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