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9Cyhoeddwyd 1991Pynciau “...Shrubland ecology New Zealand Pictorial works...”
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10Cyhoeddwyd 1995Pynciau “...Forest ecology New Zealand Pictorial works....”
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12Cyhoeddwyd 1992Pynciau “...Forest ecology New Zealand Pictorial works....”
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13Cyhoeddwyd 1993Pynciau “...Stream ecology New Zealand Pictorial works Study and teaching....”
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