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  1. pdf1-20-1969-70.pdf 
    https://www.nlm.nih.gov/.../nlmarchives/techbull/1-20-1969-70.pdf
    ... produced during the last three years, on the theory that any bibliography over three years old which ... DOSAGE RADIOTHERAPY RADIOISOTOPE TELETHERAPY RADIOTHERAPY DOSAGE RADIOTHERAPY, HIGH ENERGY RADIOTHERAPY (Ionizing) (NEOPLASM RADIOTHERAPY - 1964-65 PITUITARY GLAND ...