Thomas, C. (1889). The circular, aquare, and octagonal earthworks of Ohio. Govt. print. off..
Style de citation Chicago (17e éd.)Thomas, Cyrus. The Circular, Aquare, and Octagonal Earthworks of Ohio. Washington: Govt. print. off., 1889.
Style de citation MLA (9e éd.)Thomas, Cyrus. The Circular, Aquare, and Octagonal Earthworks of Ohio. Govt. print. off., 1889.
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