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1Llyfrgan Conroy, John D. (John David), 1938-“...Institute of Applied Social and Economic Research (Papua New Guinea)...”
Cyhoeddwyd 1977
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2LlyfrCyhoeddwyd 1977“...Institute of Applied Social and Economic Research (Papua New Guinea)...”
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3Llyfrgan Baxter, P. F.“...Institute of Applied Social and Economic Research (Papua New Guinea)...”
Cyhoeddwyd 1976
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4LlyfrCyhoeddwyd 1984“...Institute of Applied Social and Economic Research (Papua New Guinea)...”
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5LlyfrCyhoeddwyd 1979“...Institute of Applied Social and Economic Research (Papua New Guinea)...”
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6LlyfrCyhoeddwyd 1987“...Institute of Applied Social and Economic Research (Papua New Guinea)...”