Author
National Science Foundation (U.S.)
3
National Science Board (U.S.)
2
National Science Foundation (U.S.). Division of Science Resources Statistics
2
National Science Foundation (U.S.). Division of Science Resources Studies
2
United States. National Aeronautics and Space Administration,
2
Lewis Research Center
1
National Center for Science and Engineering Statistics (National Science Foundation (U.S.)),
1
National Science Foundation (U.S.),
1