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Coal Resources of the United States
A report about the United States's coal supply. The U.S. has 25 percent of the world's identified coal resources and about 20 percent of the world's estimated total coal resources.
Date:
January 1, 1974
Creator:
Averitt, Paul
System:
The UNT Digital Library
Copper Mosses as Indicators of Metal Concentrations
A report that analyses samples of copper mosses and their substrates and compares these analyses with those published elsewhere.
Date:
1967
Creator:
Shacklette, Hansford T.
System:
The UNT Digital Library