Collection search - ADVISORY COMMITTEE ON RADIOLOGICAL PROTECTION M. Lupien, Same letter to: Dr. N.E. Gentner, Dr. R. Osborne, Dr. Warren K. Sinclair, Dr. H. Smith, Dr. A. Kaul, and Dr. Arthur C. Upton, enclosing copy of ACRP-18, "Report on Biological Effects of Low Doses of Radiation at Low Dose Rate",