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Evaluation of the sensitivity of inventory and monitoring national parks to acidification effects fr

Sullivan, Timothy J. (Timothy Joseph), 1950- author.
Denver, Colorado : U.S. Department of the Interior, National Park Service, Natural Resource Program Center, 2011. 2011

Evaluation of the sensitivity of inventory and monitoring national parks to nutrient enrichment effe

Sullivan, Timothy J. (Timothy Joseph), 1950- author.
Denver, Colorado : U.S. Department of the Interior, National Park Service, Natural Resource Program Center, 2011. 2011

A story written in the rocks : the geology of Voyageurs National Park

Hemstad, Christopher B. (Christopher Borgen), author.
International Falls, MN : National Park Service, Voyageurs National Park, [2013] 2013