551.49
I61R
               Radioisotopes in hydrology proceedings of the symposium on the application of radioisotopes in hydrology held by the International Atomic Energy Agency in Tokyo, 5-9 March 1963 - Vienna : International Atomic Energy Agency, 1963.
               448p. - Proceedings series .
47850
                Subjects: Radioisotopes in hydrology; Radioactive tracers; Ground water.