Subject ASC0003svq

The geological magazine, or, Monthly journal of geology.
Decade 2:v.8 (1881), Page 142 (1881)
Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
BHL Page 32519395

Keywords

stratum strike and dip proof inclined plane Sopwith's models math vector foreshortening stratum mathemetical drawing polygon

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