By Park Joungkoo   Ellis Gary D.   Kim Samuel S.   Ruddell Edward J.   Agrusa Jerome   in Journal of Travel & Tourism Marketing

ISSN:1054-8408|21|2-3|89-103

Haworth Press‎(2007)‎

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By Rudis Victor A.   Gramann James H.   Ruddell Edward J.   Westphal Joanne M.   in Forest Science

ISSN:0015-749X|34|4|846-863

Society of American Foresters‎(1988)‎

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