Author
SpringerLink (Online Service)
4,447
SpringerLink (Online service)
3,919
ScienceDirect (Online service)
1,451
Infobase,
860
integral CALC (Firm)
738
Geological Survey (U.S.)
557
Geological Survey (U.S.),
500
National Center for Education Statistics
133
Films for the Humanities & Sciences (Firm)
126
Infobase
125
Educational Resources Information Center (U.S.)
112
Oxford Scholarship Online
107
National Renewable Energy Laboratory (U.S.),
91
Educational Testing Service
79
EBSCOhost
77
Roche, Bob
74
National Institute of Standards and Technology (U.S.)
73
Pardalos, P. M. 1954-
66
National Assessment of Educational Progress (Project)
58
Brook Lapping Productions
57
ProQuest (Firm)
57
Carroll, Catherine, 1951-
51
Reese, Clyde M.
51
National Institute of Education (U.S.)
50
Ballator, Nada
49
Colorado State University. Hydrology and Water Resources Program
49
Jerry, Laura
49
Mumme, Judith
49
Barzyk, Fred
48
Carr, Peggy
48
National Renewable Energy Laboratory (U.S.)
46
United States. Office of Educational Research and Improvement
43
Glasshead Productions
36
Ebooks Corporation
35
Annenberg Learner (Firm)
32
National Science Foundation (U.S.)
32
Colorado State University. Department of Atmospheric Science
29
United States. Bureau of Reclamation
29
Coast Survey Development Laboratory (U.S.)
28
United States. Bureau of Mines
27
Television Junction
26
United States. Bureau of Land Management
26
United States. Department of Energy
26
United States. Environmental Protection Agency
26
United States. National Bureau of Standards
25
ScienceDirect (Online Service)
24
United States. Department of Agriculture. Economic Research Service
24
Mathematical Association of America
23
National Council of Teachers of Mathematics
23
United States. Army. Corps of Engineers
23
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