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7gan Manaster, Guy J and Havighurst, Robert JAwduron Eraill: “...Havighurst, Robert J...”
Cyhoeddwyd 1972
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9Awduron Eraill: “...Havighurst, Robert J...”
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10Cyhoeddwyd 1975Awduron Eraill: “...Havighurst, Robert J...”
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11
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12gan Warner, W. Lloyd (William Lloyd), 1898-1970Awduron Eraill: “...Havighurst, Robert J. (Robert James), 1900-1991...”
Cyhoeddwyd 1946
Printed Book