Geographic information systems (GIS) and mapping---practices and standards.

por Johnson, Arnold Ivan 1919-
Publicado 1992

Ground-water contamination : field methods : a symposium sponsored by ASTM Committees D-19 on Water and D-18 on Soil and Rock Cocoa Beach, Fl, 2-7 Feb. 1986

por Johnson, Arnold Ivan 1919-, Collins, Gene
Publicado 1988