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4gan Townley, GarryPynciau “...Public relations New Zealand Forests and forestry....”
Cyhoeddwyd 1985
Traethawd Ymchwil Llyfr -
5gan Fazio, James R.Pynciau “...Public relations Conservation of natural resources....”
Cyhoeddwyd 1981
Llyfr -
6Kuma to mukiau /熊と向き合う /gan Kurisu, Koji, 1960-Pynciau “...Conservation of natural resources Public relations Japan....”
Cyhoeddwyd 2001
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7gan Pilkey, Orrin H., 1934-Pynciau “...Corps of Engineers Public relations Case studies....”
Cyhoeddwyd 1996
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