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- Thickness of Bituminous-Coal and Lignite Seams at All Mines and Thickness of Overburden at Strip Mines in the United States in 1950
- Report issued by the U.S. Bureau of Mines discussing bituminous-coal and lignite seams, and overburden of strip mines during 1950. Descriptions of the seams and strip mines are presented. This report includes tables, maps, and illustrations.
- Thickness of Bituminous Coal and Lignite Seams Mined in 1965
- Report issued by the Bureau of Mines discussing the thickness of coal seams mined in the United States between 1945 and 1965. Locations, and production of coal seams are presented. This report includes tables.