Practical operating procedures for progressive rehabilitation of sand and gravel sites - Johnson, Craig; University of Illinois. Department of Landscape Architecture (Silver Spring, Md. National Sand and Gravel Association, 1966)
"This research project of the University of Illinois was sponsored by the National Sand and Gravel Association..."
"...Second published report based upon the research program...at the Department of Landscape Architecture at the University of Illinois"--Foreword
Keywords: Sand and gravel industry -- United States