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[Trace Elements Program, Field and Colorado Plateau Projects, February 1948]
Two illustrations showing locations of Trace Elements Offices in the United States and an index map of part of the Colorado Plateau produced for a Febuary 1948 report of the U.S. Geological Survey's trace element investigations.
Date:
1948-03~
Creator:
Geological Survey (U.S.). Trace Elements Office.
System:
The UNT Digital Library