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Published by U.S. Geological Survey, Washington D.C., 1956
Condition: very good. Since 1947, the U.S. Geological Survey has measured and sampled phosphatic parts of the Phosphoria formation of Permian age and its partial stratigraphic correlatives at many localities in Montana, Idaho, Wyoming, and Utah. DG3. stapled binding, 11" Tall, cover clean, pages clean, binding very good, 30 pages.