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Obradovich, J.D., 1982, NDS 157; Albian, K‑Ar/biotite‑bentonite, Middle West North American Basin, in Odin, G.S., ed., Numerical dating in stratigraphy, John Wiley & Sons, p. 838‑839.
Obradovich, J.D., and Cobban, W.A., 1977, Speculations on the age span of the Albian Stage (Early Cretaceous)[abs.], Geological Society of America Abstracts with Programs, v. 9, no. 7, p. 1117‑1118. [Periodicals]
Obradovich, J.D., and Cobban, W.A., investigators, 1978, K‑Ar dating of the Albian, U.S. Geological Survey Professional Paper 1100, 191 p. [GD I 19.16:1100]
O'Brien, B.D., 1909, Cyaniding Black Hills blue ores, Mines and Minerals, v. 29, p. 427‑431. [Periodicals]
Ochoa, R.E., 1970, Depositional environments of the Newcastle formation (cretaceous) interpreted from outcrops in the Black Hilss area northeastern Wyoming, Rapid City, South Dakota School of Mines and Technology M.S. thesis.
Odman, O.H.R., 1945, Beryllkristall av jatteformat hittad i U.S.A. (large beryl crystal, Ingersoll quarry, Keystone, South Dakota), Geol. Foren. Stockholm, Forh., Band 67, Haefte 1, p. 78. [Periodicals]
O'Harra, B.M., 1916, Black Hills gold‑bearing iron‑quartz‑tremolite belt, Engineering and Mining Journal, v. 101, p. 770‑773. [Periodicals]
O'Harra, C.C., 1899, Notes on the geology and mineral deposits of a portion of the southern Black Hills‑‑General geology, South Dakota School of Mines Bulletin 2, p. 3‑28. [Periodicals]
O'Harra, C.C., 1900a, A bibliography of contributions to the geology and geography of the Black Hills region, South Dakota School of Mines and Technology Bulletin 4, p. 45‑88. [Periodicals]
O'Harra, C.C., 1900b, A history of the early explorations and of the progress of geological investigation in the Black Hills region, South Dakota School of Mines and Technology Bulletin 4, p. 7‑44. [Periodicals]
O'Harra, C.C., 1901a, Black Hills ore deposits, International Mining Congress, 4th Annual Session, Proceedings, Boise, Idaho, p. 97‑100.
O'Harra, C.C., 1901b, The production of gold in the Black Hills, The Aurum, v. 1., 2 p. [Periodicals]
O'Harra, C.C., 1902a, The earliest map of Black Hills mining claims, The Aurum, v. 2, p. 11‑12. [Periodicals]
O'Harra, C.C., 1902b, The mineral wealth of the Black Hills, South Dakota School of Mines and Technology Bulletin 6, 88 p. [Periodicals]
O'Harra, C.C., 1902c, The mineral wealth of the Black Hills, South Dakota School of Mines and Technology Bulletin 6, 88 p. [Periodicals]
O'Harra, C.C., 1904a, The geology and mineralogy of the Black Hills region, Black Hills Mining Men's Booklet, p. 119‑127.
O'Harra, C.C., 1904b, The geology of the Black Hills uplift, Black Hills Illustrated, p. 33‑35. [MBC/F/657/.B6/B18 also in SD LC COLL & LOCKED CASE]
O'Harra, C.C., 1911, Pahasapa‑‑The Black Hills, Pahasapa Quarterly, v. 1, p. 5‑11. [Periodicals]
O'Harra, C.C., 1912, The School of Mines map of the Black Hills region, Pahasapa Quarterly, v. 1, 2, p. 33. [Periodicals]
O'Harra, C.C., 1913a, Artesian possibilities of the Black Hills, The Pahasapa Quarterly, v. 2, p. 7‑10. [Periodicals]
O'Harra, C.C., 1913b, O'Harra's handbook of the Black Hills, Rapid City, S. Dak., 159 p. [SD LC COLL/F/657/.B6/O36]
O'Harra, C.C., 1913c, The oldest thing in South Dakota, Pahasapa Quarterly, v. 2, p. 52. [Periodicals]
O'Harra, C.C., 1914, A visit to Crystal Cave, Pahasapa Quarterly, v. 4, p. 19‑25. [Periodicals]
O'Harra, C.C., 1916a, An early magazine article on the Black Hills, Pahasapa Quarterly, v. 5, p. 11‑16. [Periodicals]
O'Harra, C.C., 1916b, Tungsten production and price, Pahasapa Quarterly , v. 5, p. 9‑12. [Periodicals]
O'Harra, C.C., 1917a, A bibliography of the geology and mining interests of the Black Hills region, South Dakota School of Mines and Technology Bulletin 11, 216 p. [Periodicals]
O'Harra, C.C., 1917b, Fossil footprints in the Black Hills, The Pahasapa Quarterly, v. 6, 4, p. 20‑24. [Periodicals]
O'Harra, C.C., 1919, Lignite coals and their utilization, Pahasapa Quarterly, v. 8, p. 16‑35. [Periodicals]
O'Harra, C.C., 1924, Materials used in the making of Portland cement, Black Hills Engineer, v. 12, p. 59‑64. [Periodicals]
O'Harra, C.C., 1929a, An inventory of our mineral materials (South Dakota), Black Hills Engineer, v. 17, p. 5‑11. [Periodicals]
O'Harra, C.C., 1929b, Bentonite, its occurrence, properties, and uses, Black Hills Engineer, v. 17, p. 39‑48. [Periodicals]
O'Harra, C.C., 1929c, Coal resources of the Black Hills region (South Dakota), Black Hills Engineer, v. 17, p. 49‑61. [Periodicals]
O'Harra, C.C., 1929d, Custer's Black Hills expedition of 1874, The Black Hills Engineer, v. 17, p. 285. [Periodicals]
O'Harra, C.C., 1930, The blue siliceous ores near Deadwood, Black Hills Engineer, v. 18. [Periodicals]
O'Harra, C.C., 1931a, Early placer gold mining in the Black Hills, Black Hills Engineer, v. 19, p. 362. [Periodicals]
O'Harra, C.C., 1931b, The gold‑mining industry of the Black Hills, Black Hills Engineer, v. 19, p. 3‑9. [Periodicals]
O'Harra, C.C., 1932a [1933], General geology, in O'Harra, C.C., ed., The Black Hills, International Geological Congress, 16th session, Guidebook 25; excursion C‑2, p. 1‑6. [SD LC COLL/QE/164/.B55/O36/1932]
O'Harra, C.C., 1932b, A new meteorite from the Black Hills, Science, v. 76, p. 34. [Periodicals]
O'Harra, C.C., 1932c, The Homestake Mine, Black Hills Engineer, v. 20. [Periodicals]
O'Harra, C.C., and Connolly, J.J., 1926, The geology, mineralogy, and scenic features of Custer State Park, South Dakota, South Dakota School of Mines and Technology Bulletin 14, 123 p. [Periodicals]
O'Harra, C.C., and Connolly, J.P., 1932d [1933], Western and northern Black Hills, in O'Harra, C.C., ed., The Black Hills, International Geological Congress, 16th session, Guidebook 25; excursion C‑2, p. 6‑17. [SD LC COLL/QE/169/.B55/O36/1932]
O'Harra, C.C., ed., 1932 [1933], The Black Hills, International Geological Congress, 16th session, Guidebook 25; excursion C‑2, 29 p. [SD LC COLL/QE/164/.B55/O36/1932]
O'Harra, C.C., and Forsyth, A., 1899, Notes on the geology and mineral deposits of a portion of the southern Black Hills, South Dakota School of Mines Bulletin 2, 41 p. [Periodicals]
O'Harra, C.C., and Jeffries, Zay, 1910, Map of the Black Hills region (first edition), Rapid City, S. Dak., single sheet. [SD COLL ?? NOT CATALOGED!]
O'Harra, C.C., and Jeffries, Zay, 1910, Map of the Black Hills region, Rapid City, S. Dak. [SD COLL ?? NOT CATALOGED!]
O'Harra, C.C., and others, 1908, Cement resources of the Black Hills, South Dakota School of Mines and Technology Bulletin 8, 55 p. [Periodicals]
O'Harra, C.C., and others, 1932, The Black Hills, 16th International Geology Congress, Guidebook 25, Excursion C‑2, 1932. [SD LC COLL/QE/164/.B55/O36/1932]
O'Harra, C.C., and Todd, J.E., 1902, Mineral resources of South Dakota, South Dakota Geological Survey Bulletin 3, 136 p. [SD DOCS/QE/163/.A3]
Olson, J.C., and Adams, J.W., 1962, Thorium and rare earths in the United States, U.S. Geological Survey Mineral Investigations Resource Map MR‑28, scale 1:3, 168, 000. [MAPS/G/3701s/.H1/var./.U52/no.28]
Olson, K.R., 1976, The isotopic composition of strontium and the origin of igneous intrusive rocks of the northern Black Hills province of western South Dakota, Rapid City, South Dakota School of Mines and Technology, M.S. thesis, 52 p.
O'Neal, Murray, and Stearns, D.W., 1955, Geology of the Galena, South Dakota area [abs.], Geological Society of America Bulletin, v. 66, p. 1678‑1679. [Periodicals]
Onoda, Kiyoko, 1948, The correlation of the Newcastle and associated sandstones, Rapid City, South Dakota School of Mines and Technology M.S. thesis, 42 p.
Orr, H.K., 1959, Precipitation and streamflow in the Black Hills, Ft. Collins, Colo., U.S. Department of Agriculture, Forest Service Paper no. 44. [GD A ]
Orville, P.M., 1958a, Composition of feldspar pairs from pegmatites and their application as a temperature indicator (South Dakota) [abs.], Geological Society of America Bulletin, v. 69, p. 1625. [Periodicals]
Orville, P.M., 1958b, Composition of some unzoned pegmatites in the Keystone district, South Dakota, New Haven, Yale University Ph.D. dissertation.
Orville, P.M., 1958c, Composition of unzoned pegmatites in southern Black Hills, South Dakota [abs.], American Geophysical Union Transactions, v. 39, p. 527. [Periodicals]
Orville, P.M., 1960, Petrology of several pegmatites in the Keystone district, Black Hills, South Dakota, Geological Society of America Bulletin, v. 71, p. 1467‑1490. [Periodicals]
Osborn, H.F., 1905, Tyrannosaurus and other Cretaceous carnivorous dinosaurs, American Museum of Natural History Bulletin, v. 21, p. 259‑265. [Periodicals]
Osdal, L.K., 1933, Glass sands in the Black Hills, Professional, Rapid City, South Dakota School of Mines and Technology.
Osterwald, F.W., 1955, Relation of tectonic elements in Precambrian rocks to uranium deposits in the Cordilleran Foreland of the western United States, in Page, L.R., Stocking, H.E., and Smith, H.B., compilers, Contributions to the geology of uranium and thorium by the United, States Geological Survey and Atomic Energy Commission for the United Nations International Conference on peaceful uses of Atomic Energy, Geneva, Switzerland, 1955, U.S. Geological Survey Professional Paper 300, p. 329‑335. [GD I 19.16:300]
Osterwald, F.W., Osterwald, D.B., Long, J.S., Jr., and Wilson, W.H., 1959, Mineral resources of Wyoming, Geological Survey of Wyoming Bulletin 50, 259 p. [MBC/QE/181/.A212/no.50]
Osterwald, F.W., 1963 [1964], Structural control of uranium‑bearing vein deposits and districts in the conterminous United States, U.S. Geological Survey Professional Paper 455‑G, p. 121‑146. [GD I 19.16:455-G]
Osterwald, F.W., and Dean, B.A., 1957, Preliminary tectonic map of western South Dakota, showing the distribution of uranium deposits, U.S. Geological Survey Mineral Investigations Field Studies Map MF‑128, scale 1:500, 000. [MAPS/G/3701s/.H1/var./.U5/no.128]
Osterwald, F.W., and Dean, B.A., 1961, Relation of uranium deposits to tectonic pattern of the central Cordilleran foreland, U.S. Geological Survey Bulletin 1087‑I, p. 337‑390. [GD I 19.3:1087-I]
Osterwald, F.W., and Osterwald, D.B., 1952, Wyoming mineral resources, Wyoming Geological Survey Bulletin 45, 215 p. [MBC/QE/181/.A212/no.45]
Osterwald, F.W., Osterwald, D.B., Long, J.S., and Wilson, W.H., 1966, Mineral resources of Wyoming, Geological Survey of Wyoming Bulletin 50, revised by W.H. Wilson, 287 p. [MBC/QE/181/.A212/no.50]
O'Toole, F.S., 1981, Petrology of the Cenozoic phonolites and related rocks of the Houston Creek area, Bear Lodge Mountains, Wyoming, Grand Forks, University of North Dakota M.S. thesis, 112 p.
Overman, V.K., 1935, Collecting in the Black Hills, Rocks and Minerals, v. 10, p. 145‑148. [Periodicals]
Overpeck, A.C., 1902, Clevenger's cyanide plant, The Aurum, v. 1, 5 p. [Periodicals]
Owen, D.D., 1852, Incidental observations on the Missouri River, and on the Mauvaises Terres (Bad Lands), in Report of a Geological Survey of Wisconsin, Iowa, and Minnesota, and incidentally a portion of Nebraska Territory, Philadelphia, Pa., Report of the United States Geologist, p. 194‑206. [SD LC COLL/QE/74/.O84/1852]
Owen, L.A., 1898, Cave regions of the Ozarks and Black Hills, Cincinnati, Ohio, 8 v., 228 p. [SD LC COLL/GB/604/.O97/1898]
Owen, S.J., 1976, Petrology of the Deadwood Formation from the Ragged Top Mountain cores, Black Hills, South Dakota, Rapid City, South Dakota School of Mines and Technology M.S. thesis, 149 p. [THESIS/QE/445/.S897/1976]
Owens, M.R., 1951, A geologic study of the Juniper Mine area, Rapid City, South Dakota School of Mines and Technology B.S. thesis.