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| Keywords: Johnson, ralph.jpg Dr Ralph E Johnson former Chief Radiation Branch National Cancer Institute Topics/Categories Historical People National Cancer Institute People Type B W Photo Source National Cancer Institute NCI Edward Hubbard Photographer 8659 date Reuse Restrictions None - This image is in the public domain and can be freely reused Please credit the source and/or author listed above Edward Hubbard Photographer PD-USGov-HHS-NIH Media from National Cancer Institute Visuals Online Images uploaded by Fæ | ||||
