por Purdue Industrial Waste Conference (38 : 1983 : Purdue University, West Lafayette, Indiana) | Purdue University. School of Civil Engineering | Purdue University. Division of Conference and Continuation Services.
por Industrial Waste Conference (41 : 1986 : Purdue University) | Purdue University. Division of Conference and Continuing Education | Indiana. Department of Environmental Management | Pardue University. School of Civil Engineering.
por Industrial Waste Conference (45 : 1990 : Purdue University) | Purdue University. School Of Civil Engineering Continuing Education | Indiana. Department of Environmental Management.