ICRP PUBLICATIONS 15 and 21 528,012 Protection against ionizing radiation from external sources.A report by committee 3 of the International Commission on Radiological Protect ion.Adopted by the commission in November 1969 and orginally publ. as ICRP Publication 15 and data for protection against ionizing radiation from external sources... Oxford 1976 Pergamon Press 8° s.XI,nlb.1,141 Radiation Protection ICRP Publications 15 and 21