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National Register of Historic Places Multiple Property Documentation Form

其他書名	The Conservation Movement in Iowa, 1857-1942
出版	United States Department of the Interior, National Park Service, 1991
URL	http://books.google.com.hk/books?id=vNOZAQAACAAJ&hl=&source=gbs_api

註釋Report from a survey conducted to identify Iowa historical resources that exemplify the conservation movement in Iowa between 1857 and 1942. The survey identified resources within 5 historical contexts: wildlife conservation, 1857-1942; forest conservation, 1866-1942; parks, c. 1890-1942; conservation of native flora, 1909-1942; and soil and water conservation, 1901-1942.