Heuser, R. L. (1976). Fertility tables for birth cohorts by color: United States, 1917-73. U.S. Dept. of Health, Education, and Welfare, Public Health Service, Health Resources Administration, National Center for Health Statistics ; For sale by the Supt. of Docs., U.S. Govt. Print. Off..

Heuser, Robert L. Fertility Tables for Birth Cohorts by Color: United States, 1917-73. Rockville, Md. : Washington: U.S. Dept. of Health, Education, and Welfare, Public Health Service, Health Resources Administration, National Center for Health Statistics ; For sale by the Supt. of Docs., U.S. Govt. Print. Off., 1976.

Heuser, Robert L. Fertility Tables for Birth Cohorts by Color: United States, 1917-73. U.S. Dept. of Health, Education, and Welfare, Public Health Service, Health Resources Administration, National Center for Health Statistics ; For sale by the Supt. of Docs., U.S. Govt. Print. Off., 1976.