Report issued by the Bureau of Mines over studies conducted on manganese deposits of Aroostook County, Maine. Descriptions of the deposits, and the results of the study are presented. This report includes tables, maps, illustrations, and photographs.

Report issued by the Bureau of Mines over studies conducted on the Pratt coal bed in Alabama. The report details "washability studies of coal from beds in Alabama and other southern states in which commercially important deposits occur" (p. 1). This report includes tables, graphs, and illustrations.

Report issued by the Bureau of Mines over studies conducted on geophysical surveys for exploratory drilling. Electrical-resistivity techniques are discussed. This report includes tables, maps, and illustrations.

Report issued by the Bureau of Mines over studies conducted on the Beluga River coalfield "to determine, if possible, which areas were most favorable for developing large reserves of coal suitable for open-pit mining" (p. 1). Description of the coal deposits, and results of the study are presented. This report includes tables, illustrations, and maps.

Report issued by the Bureau of Mines investigations of "converting small particle lignite to a stable, storable fuel of relatively high heating value" (p. 1). The equipment and methods used for the study are presented. This report includes tables, maps, illustrations, and photographs.

From Washington Coalfields: The geographical distribution of the principal coal areas of Washington is shown in figure 1. Detailed information concerning these fields is given in Bureau of Mines Technical Paper 491. Further information on the minor coal areas is given in two bulletins of the Washington Division of Mines and Geology. Analyses, plastic properties, free-swelling indexes, and agglutinating values of the separate coals, together with data on yields of carbonization products and properties of the cokes produced in laboratory tests and under operating conditions."

Supplementary report from the U.S. Bureau of Mines regarding the results of a survey of the natural gas (helium) resources available in the United States. From the summary: "Certain source data and results of analysis pertinent to 1,575 gas samples, which have been obtained from 26 States, Alaska, and Canada (only a few from the latter 2 regions) and analyzed in connection with the helium-survey program of the Bureau of Mines, are presented in tabular form. This publication is supplementary to Bulletin 486 of the Bureau of Mines. Samples analyzed from late 1947 to around May 1956 are included in this bulletin and augment the samples reported in Bulletin 486" (p. 1).

From Introduction: "This bulletin contains nearly 300 United States patents that relate to retorting (and distilling underground), refining, and utilization of oil shale and its products. The largest single group, of which the majority was assigned to a single company, relates to fluidized handling of shale. The patents are arranged in numerical order, and an alphabetical list of investors and assignees follows them. A classified list of all the patents will be included in Part III, European patents."

From Introduction: "This part of Bulletin 574 contains 180 United Kingdom patents that relate to retorting (and distilling underground), refining, and utilization of oil shale and its products. The largest single group, of which the majority was assigned to a single company, relates to fluidized handling of shale."

From Summary: "This report summarizes the general knowledge of low-temperature tar and traces the character of coal tar from incipient formation, through the condensation of the tar vapors, to the subsequent alteration of tar products resulting from further heating."

Report issued by the U.S. Bureau of Mines discussing coal mining roof-fall accidents during 1955 and 1956. As stated in the summary, "the study includes an analysis of individual accident reports, sets forth the measurable factors, and compares such factors with a representative sample of average data from 39 anthracite mines and 117 bituminous mines" (p. 1).

Report issued by the U.S. Bureau of Mines discussing the lode-tin mining operations of Seward Peninsula, Alaska. History, geology, production, and mining methods are presented. This report includes tables, maps, illustrations, and photographs.

Report issued by the U.S. Bureau of Mines discussing water-control issues at the Chief Mine in Juab County, Utah. Unique methods for water control are presented. This report includes tables, maps, illustrations, and photographs.

Report issued by the U.S. Bureau of Mines discussing the mining of phosphate rock in Rich County, Utah. As stated in the introduction, "this information circular describes methods used in mining inclined beds of phosphate rock in mines operated by San Francisco Chemical Co." (p. 1). This report includes maps, illustrations, and photographs.

Report issued by the U.S. Bureau of Mines discussing the development of Turkey's mineral industry. Mineral production, consumption, and trade are presented. This report includes tables, maps, illustrations, and photographs.