U.S. Dept. of Health, Education, and Welfare, Social Security Administration, Office of Research and Statistics; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.1968]<EG131-3>
by Donald E Rigby and Malcolm H. MorrisonU.S. Dept. of Health, Education, and Welfare, Social Security Administration, Office of Research and Statistics : for sale by the Supt. of Docs., U.S. Govt. Print. Off.1978
Lola M. Irelan ... [et al.]U.S. Dept. of Health, Education, and Welfare, Social Security Administration, Office of Research and Statistics : for sale by the Supt. of Docs., U.S. Govt. Print. Off.1976
U.S. Dept. of Health, Education, and Welfare, Social Security Administration, Office of Research and Statistics [for sale by the Supt. of Docs., U.S. Govt. Print. Off.]19uu.<EG5-64>