by Philip Frohlich ; in collaboration with Mary E. Burdette, Robert H. Cormier, M. Taylor Matthews
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. Officce
1974
Research report
no. 46 , DHEW publication
no. (SSA) 75-11803
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