01050cam a2200277 4500 gs 68000221 DLC 20260227111422.0 690523s1968 dcuab b 000 0 eng c gs 68000221 U.S. Geological Survey Library DLC DLC QE75 .C5 no. 552 553/.78/09811 Oltman, Roy E. (Roy Edwin), 1911- Reconnaissance investigations of the discharge and water quality of the Amazon River, by Roy E. Oltman. Washington, 1968. iii, 16 p. illus., maps. 26 cm. United States. Geological Survey. Circular 552 Prepared in cooperation with the Ministerio da Marinha do Brazil [and the] University of Brazil. Bibliography: p. 16. Stream measurements Amazon River. Water quality Amazon River. Brazil. Ministerio da Marinha. Rio de Janeiro. Universidade Federal. Geological Survey circular ; 552. 30456 30456