Report issued by the Bureau of Mines discussing the mechanical equipment used in oil and gas wells of the Oklahoma City field. As stated in the introduction, "this paper presents the results of a study devoted chiefly to new equipment that has been developed to meet the requirements of drilling and producing operations in the Oklahoma City field and that has been accepted by drilling contractors and operators" (p. 1). This report includes tables, illustrations, and photographs.

Report issued by the U.S. Bureau of Mines discussing the "occurrence, milling, and metallurgy of manganese in the United States" (p. 1). Different properties and compounds of manganese are also discussed. This report includes a map, tables, illustrations, and photographs.

Report issued by the U.S. Bureau of Mines on the different types of gases that are present in coal. Theories behind why these gases occur in coal are presented. This report includes tables and graphs.

Report issued by the U.S. Bureau of Mines discussing explosions in coal mines that occurred in West Virginia between 1883 and 1933. The number of fatalities, and safety prevention methods are presented. This report includes tables.

Report compiled by the U.S. Bureau of Mines including statistics on fatal and non-fatal accidents in coal mines located in the United States as well as data regarding the various operations (e.g., number of miners employed and average production). The information is organized into tables for comparison and the text draws some overall conclusions in the summary.

From Scope of Report: "The subject matter in this bulletin is divided as follows: Theory of evaporation; methods of determining evaporation losses; lease operation; transportation and storage of crude petroleum; and evaporation losses of gasoline at the refineries."