Oxford Scholarship Online 12,704 SpringerLink (Online service) 2,308 SpringerLink (Online Service) 1,065 Geological Survey (U.S.) 997 ScienceDirect (Online service) 818 Geological Survey (U.S.), 610 Oxford Scholarship Online (Online Service) 467 Obama, Barack, 253 Literature Online (Online Service) 233 Obama, Barack 207 Infobase, 198 United States. President (2009-2017 : Obama) 188 United States. President (2009-2017 : Obama), 182 United States. Congress. House. Committee on Foreign Affairs, 159 EBSCOhost 156 Library of Congress. Congressional Research Service, 150 Osborne, Mary Pope 135 United States. Congress. House. Committee on Foreign Affairs 131 Films for the Humanities & Sciences (Firm) 122 Infobase 120 Oxford University Press 96 United States. Bureau of Mines 95 Open University 89 Orchestra sinfonica dell'EIAR, 80 Off the Fence Productions 79 National Center for Education Statistics 75 Oak Ridge National Laboratory 75 Mozart, Wolfgang Amadeus, 1756-1791 72 U.S. Atomic Energy Commission 72 O'Rourke, Ronald, 71 Offenbach, Jacques, 1819-1880 67 Ormandy, Eugene, 1899-1985, 65 O'Sullivan, Robert Brett, 1923- 60 Ocampo, Ramon de 59 Olmsted Center for Landscape Preservation (U.S.) 59 Educational Resources Information Center (U.S.) 57 Oates, Joyce Carol, 1938- 56 Puccini, Giacomo, 1858-1924 56 O'Neill, Eugene, 1888-1953 54 O'Sullivan, Christine Y. 53 National Renewable Energy Laboratory (U.S.), 51 Oklahoma Water Resources Board 51 Educational Testing Service 50 National Renewable Energy Laboratory (U.S.) 50 Beethoven, Ludwig van, 1770-1827 49 Oke, Janette, 1935- 47 National Center for Health Statistics (U.S.), 45 Olmsted Center for Landscape Preservation (U.S.), 45 Oxford University Press, 45 Osho 44 Philadelphia Orchestra, 44 United States. Bureau of Reclamation 44 United States. Congressional Budget Office 44 Handel, George Frideric, 1685-1759 43 ProQuest (Firm) 42 United States. Administration on Aging 42 United States. Environmental Protection Agency 42 Verdi, Giuseppe, 1813-1901 42 Tchaikovsky, Peter Ilich, 1840-1893 41 United States. Department of Agriculture. Economic Research Service 41 Oregon. Department of Geology and Mineral Industries 38 Orszag, Peter R. 38 U.S. Fish and Wildlife Service 38 National Institute of Standards and Technology (U.S.) 37 Oklahoma Geological Survey 37 Rossini, Gioacchino, 1792-1868 37 United States. Federal Highway Administration 37 Oregon. Water Resources Department 36 United States. National Park Service 36 O'Connor, Jane 35 O'Reilly, Bill 35 Townshend, John B. 35 Ghione, Franco, 33 Obaidat, Mohammad S. 1952- 33 O'Connell, R. V. 32 Ohio. Department of Transportation 32 Berlioz, Hector, 1803-1869 31 Debussy, Claude, 1862-1918 31 United States. Congress. House. Committee on Appropriations, 31 United States. Department of Energy 31 Ebooks Corporation 30 Mascagni, Pietro, 1863-1945 30 Osiris Entertainment, LLC 30 Oswego County Planning Board 30 Overstreet, William C. 1919- 30 Ravel, Maurice, 1875-1937 30 United States. Department of Agriculture. Economic Research Service, 30 Haydn, Joseph, 1732-1809 29 Miller, Todd S., 29 National Institute of Education (U.S.) 29 Omni Institute 29 Orchestre de la Suisse romande, 29 Orwell, George, 1903-1950 29 Warner Home Video (Firm) 29 Bach, Johann Sebastian, 1685-1750 28 Colorado Agricultural Experiment Station 28 Brahms, Johannes, 1833-1897 27 Dutoit, Charles, 27 Oakley, W. T. 1942- 27 Ostling, Acton Eric 27