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  1. 1
    by Manning, Robert E., 1946-
    Published 2011
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    Studies in outdoor recreation : search and research for satisfaction /
  2. 2
    by Manning, Robert E., 1946-
    Published 2012
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    Managing outdoor recreation : case studies in the national parks /
  3. 3
    Published 2018
    Other Authors “...Manning, Robert E., 1946-...”
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    Natural quiet and natural darkness : the "new" resources of the National parks /

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