Subject ASC0003t2h

The geological magazine, or, Monthly journal of geology.
Decade 3:v.1 (1884), Page 158 (1884)
Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
BHL Page 32520051

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figure 2 circular triangular degrees angles diagram angular rectangle numbers trignometry graphical methods in geology Alfred Harker Graphical Methods Field-Geology field-geology shapes geometry math

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