Over, W. H. (1923). Trees and shrubs of South Dakota. Pub. by the University.
Lua i Stíl Chicago (17ú heag.)Over, William H. Trees and Shrubs of South Dakota. Vermillion, S.D.: Pub. by the University, 1923.
Lua MLA (8ú heag.)Over, William H. Trees and Shrubs of South Dakota. Pub. by the University, 1923.
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