1. Geochemical balance of a small watershed and its geomorphologic implications;Cleaves;Geol. Soc. Am. Bull.,1970
2. Unusual chemistry of natural waters from the Amazon region;Furch;Acta Cient. Venez.,1982
3. Mercury and iodine distribution in Norwegian forest soils by neutron activation analysis;Låg,1971
4. Chemical compositions of rivers and lakes;Livingstone;U.S. Geol. Surv., Prof. Pap. 440-G,1963