Rockville, Md. : U.S. Dept. of Health, Education, and Welfare, Public Health Service, Health Resources Administration, National Center for Health Statstics; for sale by the Supt. of Docs., U.S. Govt. Print. Off
Rockville, Md. : U. S. Dept. of Health, Education and Welfare, Public Health Service, Health Resources Administration, National Center for Health Statistics