- Annell, C. S., 1956, Controlled atmospheres for spectrochemical analysis: Trace Elements Investigations 653, 28 leaves : ill. ; 27 cm.,
- Becraft, George E., 1956, Uranium in carbonaceous rocks in the Townsend and Helena valleys, Montana: Trace Elements Investigations 581, 24 p., 5 fig.,
- Boardman, R. L.; Bowers, H. E.; Litsey, L. R.; Sumison, C. T., 1956, Exploration for uranium-vanadium deposits in Long Park and adjacent areas in the southern part of the Uravan district, Montrose County, Colorado: Trace Elements Investigations 550, 170 p., 8 fig.,
- Breger, Irving A., 1956, Preliminary studies of coalified wood associated with uranium on the Colorao Plateau: Trace Elements Investigations 714, 49 p. : ill. ; 29 cm.,
- Burbank, Wilbur Swett, 1956, Principles of formation of chimney-like vents in shallow volcanic environments: Trace Elements Investigations 711, 22 p. : ill. ; 27 cm.,
- Bush, Alfred Lerner; Bromfield, C. S.; Pierson, Charles Thomas, 1956, Areal geology of the Placerville Quadrangle, Colorado: Trace Elements Investigations 547, 148 p., 9 fig.,
- Carr, Wilfred James; Alverson, Douglas C., 1956, Stratigraphy of middle Tertiary rocks in part of west-central Florida: Trace Elements Investigations 625, 210 p., 7 plates, 17 fig.,
- Cathcart, James Bachelder; McGreevy, Laurence James, 1956, Results of geologic drilling, 1953, land-pebble phosphate district, Florida: Trace Elements Investigations 576, 155 p. ; 29 cm. + folder (21 folded ill. ; 31 cm.); 20 figs.,
- Clark, Joan R.; Christ, C. L., 1956, Some observations on rutherfordine: Trace Elements Investigations 584, 13 p., 1 fig.,
- Clarke, Roy S., Jr.; Altschuler, Zalman Samuel, 1956, The determination of uranium (IV) in apatite: Trace Elements Investigations 637, 30 p.,
- Coats, Robert R., 1956, Search for radioactive intrusive rocks in New Jersey, New York, and New England: Trace Elements Investigations 392, 60 p., 9 fig.,
- Coleman, Robert Griffin; Delevaux, Maryse, 1956, Occurrence of selenium in sulfides from some sedimentary rocks of the western United States: Trace Elements Investigations 632, 54 p., 15 fig.,
- Cooper, Margaret, 1956, Bibliography and index of literature on uranium and thorium and radioactive occurrences in the United States. Parts 5, 6, and 7: Connecticut, Delaware, Illinois, Indiana, Maine, Maryland, Massachusetts, Michigan, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Vermont, and Wisconsin: Trace Elements Investigations 580, 801 p.,
- Curtis, Diane, 1956, Selected annotated bibliography of the uranium geology of igneous and metamorphic rocks in the United States and territories: Trace Elements Investigations 534, 181 p., 1 plate,
- Eargle, D. Hoye, 1956, Some uranium occurrences in west Texas: Trace Elements Investigations 574, 32 p., 4 fig.,
- Eargle, D. Hoye; Snider, John L., 1956, Stratigraphy of the uranium-bearing rocks of the Karnes County area, south-central Texas -- a preliminary report: Trace Elements Investigations 488, 46 p., 5 fig.,
- Eicher, Lee J., 1956, Exploration for uranium-vanadium deposits in the Beaver Mesa area, Mesa County, Colorado, and Grand County, Utah: Trace Elements Investigations 449, 54 p., 4 fig.,
- Evans, Howard T., Jr., 1956, The crystal chemistry and mineralogy of vanadium: Trace Elements Investigations 622, 42 p., 12 fig.,
- Feinstein, H. I., 1956, The absorption spectra of the complexes of uranium (VI) with some [beta]-diketones: Trace Elements Investigations 631, 16 p., 5 fig.,
- Finch, Warren Irvin, 1956, Geology of uranium deposits in Triassic rocks of the Colorado Plateau: Trace Elements Investigations 395, 71 p., 7 fig.,
- Fix, Carolyn E., 1956, Selected annotated bibliography of the geology and occurrence of uranium-bearing marine black shales in the United States: Trace Elements Investigations 535, 182 p., 4 indices, 1 fig.,
- Flanagan, Francis James, 1956, Semiquantitative spectrographic analysis and rank correlation in geochemistry: Trace Elements Investigations 628, 17 p., 1 fig.,
- Fletcher, Mary H.; Grimaldi, F. S.; Jenkins, Lillie B., 1956, The thoron-mesotartaric acid system for the determination of thorium: Trace Elements Investigations 350, 24 p.; 4 fig.,
- Frondel, Clifford; Riska, Daphne; Frondel, Judith Weiss, 1956, X-ray powder data for uranium and thorium minerals: Trace Elements Investigations 575, 96 p.,
- Garrels, R. M.; Pommer, A. M., 1956, Some quantitative aspects of the oxidation and reduction of Colorado Plateau ores: Trace Elements Investigations 177, 26 p. : ill. ; 29 cm.,
- Garrels, Robert Minard; Christ, C. L., 1956, Behavior of Colorado Plateau uranium minerals during oxidation: Trace Elements Investigations 588, 24 p., 2 fig.,
- Garrels, Robert Minard; Larsen, E. S., III; Pommer, A. M.; Coleman, R. G., 1956, Detailed mineral and chemical relations in two uranium-vanadium ores: Trace Elements Investigations 635, 55 p., 10 fig.,
- Geological Survey (U.S.), 1956, Geologic investigations of radioactive deposits: Semiannual progress report for December 1, 1955 to May 31, 1956: Trace Elements Investigations 620, 361 p., 68 fig.,
- Geological Survey (U.S.), 1956, Geologic investigations of radioactive deposits: Semiannual progress report for June 1 to November, 1956: Trace Elements Investigations 640, 327 p.,
- Granger, Harry Clifford; Raup, R. B., 1956, Some uranium deposits in Arizona: Trace Elements Investigations 598, 85 p., 11 fig.,
- Grimaldi, F. S.; Jenkins, Lillie B.; Fletcher, Mary H., 1956, The selective precipitation of thorium iodate from a tartaric acid-hydrogen peroxide medium : Application to the rapid spectrophotometric determination of thorium in silicate rocks and in ores: Trace Elements Investigations 489, 23 p.,
- Helz, A. W., 1956, Rapid-scanning microphotometry: Trace Elements Investigations 579, 12 p., 3 fig.,
- Huffman, Claude, Jr.; Riley, Leonard Benjamin, 1956, Determination of uranium in the ash of plants and its precision: Trace Elements Investigations 654, 23 p. : ill. ; 27 cm.,
- Hurley, Patrick M.; Fairbairn, Harold W., 1956, Abundance and distribution of uranium and thorium in zircon, sphene, apatite, epidote, and monazite in granitic rocks: Trace Elements Investigations 636, 20 p., 1 fig.,
- Joesting, Henry Rochambeau; Byerly, Perry Edward, 1956, Regional geophysical investigations of the Uravan area, Colorado: Trace Elements Investigations 399, 55 p., 8 fig.,
- Johnson, H. S., Jr., 1956, Uranium resources of the San Rafael district, Emery County, Utah : a regional synthesis: Trace Elements Investigations 546, 33 p., 3 fig.,
- Jones, Harriet Nell, 1956, Selected annotated bibliography of the geology of uraniferous and radioactive native bituminous substances, exclusive of coals, in the United States: Trace Elements Investigations 536, 50 p., 1 fig.,
- Kepferle, Roy Clark, 1956, Uranium in the Sharon Springs member of the Pierre shale in South Dakota and northeastern Nebraska: Trace Elements Investigations 587, 47 p., 4 plates, 8 fig.,
- King, Robert Ugstad, 1956, Reconnaissance investigations for uranium in the Colorado Front Range and adjacent areas, 1947-1951: Trace Elements Investigations 59, 284 p., 28 fig. [1-3, 14, 18, 19, 26, 27 missing],
- Kleinhampl, F. J.; Koteff, Carl, 1956, Botanical prospecting for uranium in the Circle Cliffs area, Garfield County, Utah: Trace Elements Investigations 604, 41 p., 4 fig.,
- Klepper, Montis Ruhl; Wyant, D. G.; Duncan, Donald Cave; Danilchik, Walter; Staatz, M. H.; Barnes, Harley; McKelvey, V. E., 1956, Notes on the geology of uranium: Trace Elements Investigations 529, 72 p.,
- Kramer, Henry, 1956, The determination of calcium in phosphate, carbonate, and silicate rocks by flame photometer: Trace Elements Investigations 623, 12 p., 1 fig.,
- Lewis, Richard Q., Sr., 1956, Fluorescent silica as a guide to uranium ore in Monument Valley, Utah and Arizona: Trace Elements Investigations 549, 15 p., 3 fig.,
- Marvin, Richard F., 1956, Synthesis of calcium vanadate minerals and related compounds: Trace Elements Investigations 616, 27 p., 3 fig.,
- Masursky, Harold, 1956, Uranium-bearing coal in the eastern part of the Red Desert area, Great Divide basin, Sweetwater County, Wyoming: Trace Elements Investigations 613, 199 p., 70 fig. [some missing],
- Milkey, Robert G.; Fletcher, Mary H., 1956, A fluorimetric study of the thorium-morin system: Trace Elements Investigations 589, 56 p., 13 fig.,
- Mobley, C. M.; Santos, Elmer S., 1956, Exploration for uranium deposits in the Yellow Cat and Squaw Park areas, Thompson district, Grand County, Utah: Trace Elements Investigations 448, 124 p., 9 fig.,
- Neuerburg, George Joseph; Antweiler, John C.; Bieler, Barrie H., 1956, Uranium content and leachability of some igneous rocks and their geochemical significance: Trace Elements Investigations 626, 23 p., 8 fig.,
- Pakiser, Louis Charles; Black, R. A., 1956, Exploring for ancient channels with the refraction seismograph: Trace Elements Investigations 481, 35 p., 11 fig.,
- Phoenix, David A., 1956, Occurrence and chemical character of ground water in the Morrison formation in southwestern Colorado and southeastern Utah: Trace Elements Investigations 320, 23 p.,
- Pierson, Charles Thomas; Weeks, W. F.; Kleinhampl, F. J., 1956, Reconnaissance for radioactivity in the metal-mining districts of the San Juan Mountains, Colorado: Trace Elements Investigations 306, 46 p.; 1 fig.,
- Powell, R. A.; Kinser, C. A., 1956, A dithizone method for the determination of lead in monazite: Trace Elements Investigations 630, 18 p., 1 fig.,
- Rosholt, John Nicholas, Jr., 1956, Quantitative radiochemical methods for the determination of the sources of natural radioactivity, Part II: Trace Elements Investigations 484, 36 p., 4 fig.,
- Sakakura, A. Y.; Lindberg, Carolyn; Faul, Henry, 1956, The equation of continuity in geology with applications to the transport of radioactive gas: Trace Elements Investigations 396, 37 p., 2 fig.,
- Schopf, James M.; Gray, Ralph J., 1956, Laboratory study of high-grade uranium-bearing lignite from Harding County, South Dakota: Trace Elements Investigations 480, 59 p., 5 fig.,
- Senftle, F. E.; Farley, T. A.; Lazar, Norman Henry, 1956, The half life of Th232 and the branching ratio of Bi212: Trace Elements Investigations 193, 12 leaves : ill. ; 27 cm.,
- Senftle, F. E.; Steiff, Lorin; Cuttitta, Frank; Kuroda, P. K., 1956, Comparison of the isotopic abundance of U235 and U238 and the radium activity ratios in Colorado Plateau uranium ores: Trace Elements Investigations 485, 11 p.,
- Sheridan, Douglas M.; Maxwell, C. H.; Collier, J. T., 1956, Geology of the Lost Creek schroeckingerite deposits, Sweetwater County, Wyoming: Trace Elements Investigations 302, 273 p. : 25 plates (20 folded), 5 tables (2 folded); maps; 29 cm.,
- Shoemaker, Eugene Merle; Newman, W. L.; Miesch, A. T., 1956, Sources of the elements in the sandstone-type uranium deposits of the Colorado Plateau: Trace Elements Investigations 629, 54 p., 10 fig.,
- Sims, Paul Kibler, 1956, Paragenesis and structure of pitchblende-bearing veins, Central City district, Gilpin County, Colorado: Trace Elements Investigations 433, 32 p., 8 fig.,
- Smith, William L.; Franck, Mona L.; Sherwood, Alexander M., 1956, Uranium and thorium in the accessory allanite of igneous rocks: Trace Elements Investigations 398, 20 p., 2 fig.,
- Stern, T. W.; Stieff, Lorin Rollins, 1956, Radium-uranium equilibrium and radium-uranium ages of some Colorado Plateau secondary minerals: Trace Elements Investigations 482, 21 p., 1 fig.,
- Stevens, R. E.; Wood, W. H.; Goetz, K. G.; Horr, C. A., 1956, Machine for preparing phosphors for the fluorimetric determination of uranium: Trace Elements Investigations 578, 22 p., 5 fig.,
- Stewart, John Harris, 1956, Proposed nomenclature of part of Upper Triassic strata in southeastern Utah: Trace Elements Investigations 447, 51 p., 8 fig.,
- Stewart, John Harris; Williams, Geogre A.; Albee, Howard F.; Raup, Omer B.; Cadigan, Robert Allen, 1956, Stratigraphy of Triassic and associated formations in part of the Colorado Plateau region: Trace Elements Investigations 397, 158 p., 16 fig.,
- Theobald, Paul Kellogg, Jr., 1956, The gold pan as a quantitative tool: Trace Elements Investigations 487, 72 p., 4 fig.,
- Thompson, Mary Eleanor; Roach, Carl Houston; Meyrowitz, Robert, 1956, Duttonite, a new quadrivalent vanadium oxide from the Peanut mine, Montrose County, Colorado: Trace Elements Investigations 582, 13 p., 2 fig.,
- Vine, James David; Prichard, George E., 1956, Geology and uranium occurrences in the Miller Hill area, Carbon County, Wyoming: Trace Elements Investigations 227, 77 p. : ill., maps ; 29 cm.,
- Walker, George Walton, 1956, Host rocks and their alterations as related to uranium-bearing veins in the United States: Trace Elements Investigations 638, 59 p., 1 fig.,
- Walker, George Walton; Osterwald, Frank W., 1956, Classification and distribution of uranium-bearing veins in the United States: Trace Elements Investigations 486, 48 p., 1 plate,
- Weeks, Alice D.; Coleman, Robert Griffin; Thompson, Mary E., 1956, Summary of the mineralogy of the Colorado Plateau uranium ores: Trace Elements Investigations 583, 50 p., 4 plates,
- Young, Edward Joseph; Altschuler, Zalman Samuel, 1956, Uranium distribution in pseudowollastonite slag from a phosphorus furnace: Trace Elements Investigations 615, 17 p., 1 fig.,
