Technical paper issued by the Bureau of Mines over "the history of the craters in the Richland gas field. The data have been collected at various times over a period of four years. The equipment and methods of control are discussed, and photographs show the surface conditions at various intervals in the life of the craters" (p. 1). This paper includes tables, maps, photographs, and illustrations.

Technical paper issued by the Bureau of Mines over an engineering study of the Cotton Valley oil field. The history, geology, development, and production of the field are discussed. This paper includes tables, maps, photographs, and illustrations.