From Abstract: "A study of the critical factors in the colorimetric determination of total iron in silicate and phosphate rocks, and in other nonmetallic materials is presented. It was desired to ascertain the wavelength of maximum absorbancy, the optimum concentration range for iron, the effect of different substances on the ferrous-o-phenanthroline system, and reproducibility of results."

Report describing a fluorimetric procedure for determining about 10^-8 percent uranium with 500-ml water samples.

Report discussing the U.S. Geological Survey's efforts to develop "equipment and techniques for rapid field measurement of radioactivity, principally portable survey counters, carborne and airborne equipment, and gamma-ray logging equipment."

This is a photogeologic map scale 1:24,000 of Elk Ridge-12 Quadrangle, San Juan County, Utah.

From introduction: A rapid appraisal of the carnotite resources of the Salt Wash sandstone member of the Morrison formation in the Carrizo Mountains area was undertaken by the U. S. Geological Survey late in 1951 in connection with its current project of geologic mapping of the area. Though brief and preliminary, this report provides a summary of production trends and estimated reserves in the area and indicates as far as possible the total potential of the area as a source of uranium. This information may be helpful in planning new milling facilities or other measures to encourage a higher rate of production.

Report discussing the U.S. Geological Survey's investigation of various radioactive mineral deposits in gold-tin placer mines of Central Alaska.

A report regarding a reconnaissance done in 1948 in order to locate radioactive deposits in the Manley Hot Springs-Rampart District, in Central Alaska.

Report discussing a geological examination of 3,750 miles of roads in the Hudson Valley and Adirondack Mountains in eastern and Central New York state to find deposits of radioactive materials. The examination took place in August 1949.

A report regarding a reconnaissance of radioactive rock of the Hudson Valley and Adirondack Mountains, New York.

From foreword: The six papers included in this report were prepared in an attempt to summarize briefly, and make available to the public, part of the information concerning uranium deposits that is in unpublished reports of work done by the U. S. Geological Survey under the auspices of the Manhattan Engineer District, and later, the U. S. Atomic Energy Commission.

From Abstract: "The equation of the standard curve used in the colorimetric determination of trace amounts of metals by means of dithizone extraction is developed, and a further expression is derived which defines the slope of the standard curve."