The following report discusses thorium and rare earth resources in the Lemhi Pass thorium area where over 200 samples were collected.

From introduction: This is one of a series of three reports on airborne radioactivity surveys in the United States. The reports contain the 185 airborne anomaly maps issued by the U. S. Atomic Energy Commission as a result of the AEC's aerial surveying program conducted from March 1952 to June 1956; two ground reconnaissance maps of Utah also are included. Most of the reconnaissance was done in the western United States.

The following report presents the geology and mineral resources of part of the Anaconda quadrangle near Butte, Montana.

The following report presents an evaluation of the mineral potential of the Spanish Peaks primitive area, Montana.

From Introduction: "This report describes the development of the petroleum industry in the United States portion of the Williston basin."

Report issued by the U.S. Bureau of Mines discussing the iron and steel scrap industry in the Pacific Northwest. As stated in the introduction, "this report surveys the supply and consumption of iron and steel scrap in the Pacific Northwest, with emphasis on Oregon and Washington" (p. 2). This report includes maps, tables, illustrations

Report issued by the Bureau of Mines discussing the minerals produced in the Missouri River Basin of Montana. The mineral resources of the area are investigated, analyzed, and presented. This report includes tables, maps, and illustrations.

Map with graded color shading to show levels of naturally-occurring gamma aeroradioactivity within the Idaho National Reactor Texting Station Area. Details about the survey and map creation are printed at right. Scale 1:250,000.

A report about the Clark Fork quadrangle which is underlain by more than 38,000 feet of low-grade metasedimentary rocks of the Precambrian Belt series. The quadrangle has both metallic and nonmetallic mineral deposits of considerable value.

This report gives a brief geological description of the Clark Fork quadrangle on the Idaho-Montana border.

A report about the Duck Creek Pass quadrangle which forms a large part of the bedrock of western Montana and adjoins other areas in which geologic studies are already completed or in progress.

This report follows geological studies of the Duck Creek Pass quadrangle, Montana during the summers of 1956 and 1957.

From introduction: This report evaluates four possible types of subsurface reservoirs for radioactive wastes in the Williston basin.

From introduction: This report on the geology of the Powder River Basin is one of a series of reports by the Geological Survey on sedimentary basins in the United States.

From abstract: The northern Black Hills bentonite mining district includes parts of Crook County, Wyo., Carter County, Mont., and Butte County, S. Dak. Within this district, many beds of bentonite occur interspersed with sedimentary strata of Cretaceous age that have an average total thickness of about 3,000 feet and consist chiefly of marine shale, marl, and argillaceous sandstone. The bentonite beds occur in formations ranging upward from the Newcastle sandstone to the lower part of the Mitten black shale member of the Pierre shale. Tertiary (?) and Quaternary deposits of gravel, sand, and silt are present on extensive terraces, and deposits of such materials also extend along stream courses in all parts of the district.

A report which includes 200,000 square miles in the southern part of the Williston basin of North Dakota, South Dakota, and Montana. The Devonian rocks consist mostly of marine carbonate, evaporite, and shale beds.

This report studies Devonian rocks in an approximately 200,000-square-mile area between Williston Basin, central Montana, and north-central Wyoming.

From introduction: The St. Regis-Superior area was studied during the summers of 1953 and 1954 as a part of geologic investigations by the U.S. Geologic Survey in and near the Coeur d'Alene district. The object of the present work was primarily threefold: to ascertain the main structural features in the area, with particular attention to the Osburn fault zone; to investigate the mineral deposits; and to determine the stratigraphic relations of the rocks.

A report discussing reconnaissance work done for uranium in North Dakota and Montana

Report issued by the Bureau of Mines over the tungsten deposits on Beaverhead County, Montana. As stated in the introduction, "this report presents information obtained from July 1955 to September 1957 on tungsten deposits in and near the Mount Torrey batholith" (p. 1). This report includes tables, maps, illustrations, and photographs.

Report issued by the Bureau of Mines over tungsten deposits of Montana. Details of the different deposits throughout the region are presented. This report includes tables, maps, and illustrations.