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1Academic Journal
المصدر: Environmental Conservation, 1984 Dec 01. 11(4), 345-350.
URL الوصول: https://www.jstor.org/stable/44517661
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2Academic Journal
المؤلفون: Leonzio, Claudio, Focardi, Silvano, Renzoni, Aristeo, Fossi, Christina
المصدر: Environmental Conservation; Winter1984, Vol. 11 Issue 4, p345, 0p