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The second paragraph in the second item in the Washington Letter in The Journal Jan. 7, 1950, page 37, is misplaced. It should have been the last paragraph of the first item (Estimate of Number of Physicians Required) in this letter. Public Health Bulletin No. 305, which is mentioned therein, pertains to the distribution of physicians, and not to "Shielding Requirements Against Radiation."
Public Health Bulletin No. 305. JAMA. 1950;142(5):351. doi:10.1001/jama.1950.02910230053018