Author
Geological Survey (U.S.)
191
National Science Foundation (U.S.)
164
National Climatic Center
119
Chemical Society (Great Britain)
113
National Climatic Data Center (U.S.)
91
United States. Weather Bureau
89
United States. National Bureau of Standards
80
Smithsonian Institution
73
United States. Environmental Data Service
67
Royal Society (Great Britain)
65
American Mathematical Society
64
ScienceDirect (Online service)
53
National Institute of Standards and Technology (U.S.)
49
United States. National Oceanic and Atmospheric Administration
48
Ontario. Ministry of Northern Development and Mines
46
Pennsylvania. Bureau of Topographic and Geologic Survey
44
JSTOR (Organization)
41
American Association for the Advancement of Science
39
National Academy of Sciences (U.S.)
39
National Science Foundation (U.S.). Division of Science Resources Studies
39
U.S. Coast and Geodetic Survey
39
National Research Council (U.S.)
38
Royal Society of Chemistry (Great Britain)
37
U.S. Fish and Wildlife Service
35
American Chemical Society
31
United States National Museum
29
United States. National Technical Information Service
29
World Meteorological Organization
29
U.S. Atomic Energy Commission
28
Geological Society of America
27
Suomalainen Tiedeakatemia
27
LINK (Online service)
26
New York State Museum
26
Association for Computing Machinery
25
e-libro, Corp
25
Chemical Rubber Company
24
Field Museum of Natural History
24
Ontario. Ministry of Natural Resources
23
American Institute of Physics
22
Eisenhower National Clearinghouse for Mathematics and Science Education
21
Florida Geological Survey
20
Unesco
20
United States Naval Observatory. Nautical Almanac Office
20
American Philosophical Society
19
Geological Survey of Canada
19
Kungl. Svenska vetenskapsakademien
19
National Academy of Engineering
19
National Conference on Weights and Measures
19
Environmental Research Laboratories (U.S.)
18
Illinois State Geological Survey
18
more ...