Subject ASC0003sce
The geological magazine, or, Monthly journal of geology.
[Decade 1]:v. 7 (1870), Page 12 (1870)
Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
BHL Page 32580365
Keywords
J. Ruskin Geology Banded and Brecciated Concretions stone Crystalline Segregation agate rocks banded concretion geology brecciated concretions segments trees