Description
Item Description:"Department of Agronomy, University of Illinois at Urbana-Champaign."
"Institute for Environmental Studies, University of Illinois at Urbana-Champaign."
"Environmental Processes Branch, Environmental Research Laboratory."
"April 1980."
"Contract number 68-03-2555."
Physical Description:xiv, 133 pages : illustrations, maps ; 28 cm.
Bibliography:Includes bibliographical references.