A Program for outdoor recreation research : report on a study conference conducted, June 2-8, 1968
by the National Academy of Sciences for the U.S. Dept. of the Interior, Bureau of Outdoor Recreation
Bok Engelsk 1969
| Utgitt | Washington : National Academy of Sciences , 1969
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|---|---|
| Omfang | X, 90 s.
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| Emner |
