Subject ASC0003sfa

The geological magazine, or, Monthly journal of geology.
[Decade 1]:v. 8 (1871), Page 206 (1871)
Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
BHL Page 32578491

Keywords

valley of denudation geological observations Valley of Denudation coal measures table diagram valley denudation erosion permian rocks older coal-measures coal sections rock permian

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