Author/Creator
- United States253
- Langley Research Center205
- United States. National Aeronautics and Space Administration202
- Lewis Research Center189
- United States. Bureau of the Census126
- United States. Environmental Protection Agency115
- United States. Environmental Protection Agency. Office of Research and Monitoring107
- United States. General Accounting Office83
- United States. Soil Conservation Service54
- Manned Spacecraft Center (U.S.)52
- United States. Congress. Senate. Committee on Foreign Relations52
- United States. Air Force. Office of Aerospace Research49
- Air Force Cambridge Research Laboratories (U.S.)48
- Ames Research Center48
- United States. Department of the Army39
- National Institute of Law Enforcement and Criminal Justice. Statistics Division38
- United States. Bureau of Labor Statistics33
- United Nations Industrial Development Organization32
- Australia. Parliament. Standing Committee on Public Works31
- Goddard Space Flight Center31