Photograph of the Series 90-S Mobile Spar. According to author Eric Orlemann, "the Mobile Spar was a diesel-electric transporter equipped with a folding 130-foot guy wire tower." It was built for hauling lumber up steep slopes. Only one unit was built and sold to a lumber company in McCall, Idaho.

Letter from Harris Leon Kempner to his uncle Robert Lee Kempner discussing the settlement of estate taxes and various proposals to raise funds for the firm of H. Kempner

Handwritten letter from Sara Kempner to Daniel W. Kempner discussing the birth of his grandson, her opinion the firm of H. Kempner's current tax situation, and enclosing some items.

Handwritten letter from David F. Weston to Daniel and Jeane Kempner thanking them for the birthday wishes.

Report documenting the suitability of Wyoming and Idaho for plant locations to produce synthetic liquid fuels, based on raw materials, water sources, and local interest.

Geologic maps and structure sections of the Johnson Creek Quadrangle in Caribou County, Idaho. This report concerns work done on behalf of the Division of Raw Materials of the U.S. Atomic Energy Commission.

A report regarding uranium-bearing carbonaceous shale and lignite in the goose creek district in Cassia County, Idaho, Boxelder County, Utah, and Elko County, Nevada.

A preliminary report on the geology of the phosphate deposits located in the Centennial Range in Montana and Idaho.

"This report and accompanying maps summarize the status of ownership of many phosphate bearing lands in southeastern Idaho. Ownership categories are (1) phosphate rights owned by Federal Government, (2) phosphate rights not owned by Federal Government, and (3) ownership status uncertain"

A report discussing an examination of the Dismal Swamp property for niobium, tantalum, and uranium.

Discussing the results of core drilling for uranium-bearing carbonaceous shale and lignite in the Goose Creek District, in Cassia County, Idaho

This report follows an investigation of a cargo truck found contaminated by various radioactive material on a routine trip from Arco, Idaho to the Hanford plant on May 8, 1952. The report analyzes the truck's route in an attempt to find the location of the contaminating region.

From summary: "This manual is designed for the purpose of clarifying operating procedures of the Materials Testing Reactor and its associated equipment. In assembling this manual a description of each item of equipment and its function is presented. In addition, the generally accepted method of operating the equipment and the best corrective measures concerning all emergencies that might be encountered are set forth herein. Descriptive drawings and written instructions pertaining to the equipment have been included to further clarify the manual."

Report discussing a study aimed at mapping out stratigraphic sections of the Permian Phosphoria formation in order to locate phosphate beds.

Report discussing the geology and uraniferous carbonaceous rocks found in the Bear River of the Fall Creek area of Bonneville County, Idaho. The report provides information regarding the geology of the area, uranium occurrences, distribution of uranium and other elements in carbonaceous materials, origin of uranium occurrences, core drilling results, and inferred reserves.

A report about the Lemhi Pass area in the Beaverhead Mountains, Lemhi County, Idaho, and Beaverhead County, Montana, which was undertaken to determine the area as a potential source of thorium.

A report about uranium bearing multiple oxide minerals first recognized in the jig-bed concentrate of the Tyee Mining Company's gold dredge on the Red River. The gravels of the placer deposits were derived from the Idaho batholith and a roof pendant of Precambrian rocks in the batholith.

The following report covers a reconnaissance for uranium-bearing carbonaceous rocks that was made during the 1952 field season in 23 areas in Colorado, Utah, Idaho, and Wyoming. This report discusses uranium samples discovered withing these locations, however it was determined that none of the deposits discovered have commercial possibilities.

The following report describes the petrography of uranium-bearing carbonaceous shale and a non-uranium-bearing impure coal from two of the drill cores that were used to explore the underground extent of the east-central part of the Goose Creek district.

Abstract: During parts of July, August, and September 1951, a reconnaissance was conducted in parts of Colorado, Wyoming, Utah, and Idaho in search of new deposits of uranium-bearing carbonaceous rocks. One significant uranium occurrence was found, the Fall Creek deposit, Bonneville County, Idaho. Several additional localities were discovered that contain uranium in concentrations many times that normally found in carbonaceous rocks.

Report discussing deposits of uranium in beds of carbonaceous shale and lignite in the Goose Creek district. The highest concentrations of uranium were found in the central part of the Salt Lake formation.

Report discussing the U.S. Geological Survey's investigation of stratigraphy of parts of the Phosphoria formation in Idaho. Abstracts of stratigraphic sections and analytical data are included for several locations in the area.

Report discussing an investigation of the Centennial Range of Montana and Idaho, and the phosphate deposits of this area. Information on the geology of the area and deposits are given as well as information regarding the quality and location of phosphate deposits.

Report discussing an investigation of copper deposits in sandstone that were believed to be possibly uraniferous, and uraniferous asphaltite deposits.