Isotope techniques for hydrology; report. [prep.] International Atomic Energy Agency. - Vienna IAEA 1964 - [2], 36 p. ill. 24 cm. - IAEA Technical reports series, no.23. International Atomic Energy Agency. Technical reports series, no.23. . Includes bibliographical references. Subjects--Topical Terms: Hydrology--Research.--Congresses.Radioactive tracers.--Congresses.Radioisotopes--Industrial applications.--Congresses. LC Class. No.: HD9698.A1 / I6 no.23 Dewey Class. No.: 551.48 PAN 1964