Peat Deposits of Ohio, Their Origin, Formation and Uses

Mineral Resources of the United States

Bulletin; Volume 173

Operating Regulations to Govern Coal-Mining Methods and the Safety and Welfare of Miners on Leased Lands on the Public Domain under the Act of February 25, 1920 (Public No. 146)

Efficiency in the Use of Oil Fuel

Abstracts of Current Decisions on Mines and Mining

Metallurgical Treatment of the Low-Grade and Complex Ores of Utah

Bulletin; Volume 118