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1970 census of population.

Washington, D.C. : U.S. Dept. of Commerce, Social and Economic Statistics Administration, Bureau of the Census, Population Division, 1973. 1973

Federal employees OPM data do not identify if temporary employees work for extended periods

United States. General Accounting Office.
Washington, D.C. : U.S. General Accounting Office, [2002] 2002

Federal scientists and engineers, 1989-93

[Arlington, VA] : Division of Science Resources Studies, Directorate for Social, Behavioral, and Economic Sciences, National Science Foundation, [1995] 1995

Sizing up the Executive Branch : fiscal year 2012.

United States. Office of Personnel Management. Data Analysis Group, author.
Washington, D.C. : United States Office of Personnel Management, 2013. 2013