Não informado. (1972). Geographical survey. Ball State University, Department of Geography and Geology.
Citace podle Chicago (17th ed.)Não informado. Geographical Survey. Muncie, Ind: Ball State University, Department of Geography and Geology, 1972.
Citace podle MLA (8th ed.)Não informado. Geographical Survey. Ball State University, Department of Geography and Geology, 1972.
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