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United States Department of Agriculture


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https://www.fs.usda.gov/treesearch/content/pdf?name=An%20integrative%20concept%20for%20visitor%20monitoring%20in%20a%20heavily%20used%20conservation%20area%20in%20the%20vicinity%20of%20a%20large%20city:%20the%20Danube%20Floodplains%20National%20Park,%20Vienna