00755cam a2200229 7i4500 0000001805 20080429090000.0 a20080429 17:00 080429 ne 044441570X NM NM TD196.T7 .P87 1977 Purves Trace-element contamination of the environment David Purves. Amsterdam: Elsevier Scientific, 1977. xi, 260p.: ill.; 23cm. Fundamental aspects of pollution control and environmental science; 1 Includes bibliographical references and index Trace elements -- Environmental aspects NM 0000002979 Book Open Shelf HQ Library