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A Comparison of Four Survey Techniques Used in Outdoor Recreation Research
Elwood L. Shafer
John F. Hamilton
Northeastern Forest Experiment Station (Radnor, Pa.)
出版
Northeastern Forest Experiment Station, Forest Service, U.S. Department of Agriculture
, 1967
URL
http://books.google.com.hk/books?id=XyJZ0AEACAAJ&hl=&source=gbs_api