by Lois S. CopelandU.S. Dept. of Health, Education, and Welfare, Social Security Administration, Office of Research and Statistics : For sale by the Supt. of Docs., U.S. G.P.O.1977
Lenore E. Bixby ... [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. G.P.O.1975