Photograph of Bretz expedition from Intermountain Motorist
Geology -- Grand Coulee (Wash.).
This page from an article titled "Red Hot Coulees" and inlcudes a photograph of J. Harlen Bretz leading a field trip to explain his theory to a group of geologists and journalists. The article was printed in the September 1928 issue of Intermountain Motorist.
Intermountain Motorist, volume 1
Spokane: Inland Automobile Association
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