Clark, Ian D. Environmental Isotopes in Hydrogeology / Ian D.Clark, Peter Fritz. - Boca Raton ; New York : Lewis Publishers, 1997. - 328 p. - 551.49028 . Index: p. 316-328 ISBN: 1-56670-249-6 Subjects--Topical Terms: Radioactive tracers in hydrogeology Dewey Class. No.: 551.49028