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C. W Bowen, J. M Everingham, Theodore C Foin, Edward O Garton, B. J Holton, R. O Schultz, and et al (1977)

Quantitative studies of visitors impacts on environments of Yosemite National Park, California and their implications

Note

Citation found in, 'Establishment and control of Bull thistle (Cirsium vulgare) in Yosemite Valley' by John M. Randall. ProCite field[7]: Foin, Theodore C. ProCite field[9]: Visitor impacts on National Parks: The Yosemite ecological impact study ProCite field[26]: p. 21-35