Rockville, Md. : U.S. Dept. of Health and Human Services, Public Health Service, Food and Drug Administration, Bureau of Radiological Health ; Washington, D.C. : For sale by the Supt. of Docs., U.S. G.P.O., 1980.

Library Shelving Facility (LSF) >> HE 20.4102:X 1/18

Rockville, Md. : U.S. Dept. of Health and Human Services, Public Health Service, Food and Drug Administration, Bureau of Radiological Health, 1981.

Library Shelving Facility (LSF) >> HE 20.4102:R 11/16