Ehlers, G. M. (1973). Stratigraphy of the Niagaran series of the northern peninsula of Michigan. Museum of Paleontol., [Univ. of Michigan].
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Citação norma Chicago
Ehlers, George Marion. Stratigraphy of the Niagaran Series of the Northern Peninsula of Michigan. [Ann Arbor]: Museum of Paleontol., [Univ. of Michigan], 1973.
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Citação norma MLA
Ehlers, George Marion. Stratigraphy of the Niagaran Series of the Northern Peninsula of Michigan. Museum of Paleontol., [Univ. of Michigan], 1973.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.