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1Cyhoeddwyd 1991Pynciau “...Environmental protection Antarctica....”
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View archived text (Bureau of Oceans and International Environmental and Scientific Affairs)
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2Cyhoeddwyd 2002PynciauElectronig Meddalwedd eLyfr
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3Cyhoeddwyd 2011Pynciau Full text available from 2011 to present
Archived copy available at the National Library of New Zealand
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7gan Wyss, BobPynciau “...Environmental protection Press coverage....”
Cyhoeddwyd 2008
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9gan Pearce, David W. (David William)Pynciau “...Environmental protection Cost effectiveness....”
Cyhoeddwyd 2006
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12gan Chasek, Pamela S., 1961-Pynciau Connect to electronic resource
Cyhoeddwyd 2010
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13gan Colombo, AndreaPynciau Connect to electronic resource
Cyhoeddwyd 2018
Traethawd Ymchwil Electronig eLyfr -
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