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| Utgitt
| Chapel Hill : University of North Carolina Press , [1967]
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| Omfang
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| Opplysninger
| Bibliographical footnotes.. - Consists of 7 lectures delivered in a seminar offered at the University of North Carolina, 1965/66, and sponsored by the Carolina Population Center, and a chapter selected from the U.S. Dept. of the Interior's Conservation yearbook no. 2, 1966.
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| Emner
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