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Attendance trends threaten future operations of America's state park systems [期刊论文]
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2019-01-01, 116 (26) : 12775-12780
Smith, Jordan W.;  Wilkins, Emily J.;  Leung, Yu-Fai
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Public views of wetlands and waterfowl conservation in the United States—Results of a survey to inform the 2018 update of the North American Waterfowl Management Plan [研究报告]
10.3133/ofr20171148U.S. Geological Survey. 2018-01-01
Wilkins, Emily J.;  Miller, Holly M. millerh@usgs.gov
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