The flora of the Ripley formation.
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TextSeries: U.S. Geological survey. Professional paper 136Publication details: Washington, U.S.Govt.Print.Off., 1925.Description: iii,94p. illus.XXIIIpl.,tables. 29cmSubject(s): LOC classification: - QE75 .P9 no. 136
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At head of title: Department of the Interior.
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