21.
 |  | Title: Water Quality International '96 Part 1: Nutrient Removal by D. Ballay, T. Asano, R. Bhamidimarri, K.K. Chin, W.O.K. Grabow, E.R. Hall, S. Ohgaki, D. Orhon, A. Milburn, C.D. Purdon ISBN: 0080430813 Publisher: Pergamon Press Pub. Date: 01 November, 1996 List Price: $22.01 Amazon.com Price: $272.00 |
22.
 |  | Title: Water Quality International '96 Part 6: Chemical, Petrochemical and Hazardous Waste Management by D. Ballay, T. Asano, R. Bhamidimarri, K.K. Chin, W.O.K. Grabow, E.R. Hall, S. Ohgaki, D. Orhon, A. Milburn, C.D. Purdon ISBN: 0080430899 Publisher: Elsevier Science Pub Co Pub. Date: 01 January, 1997 List Price: $22.01 Amazon.com Price: $22.01 |
23.
 |  | Title: Water Quality International '96 Part 8: River Basin Management; Management and Institutional Affairs; Environmental Engineering Education by D. Ballay, T. Asano, R. Bhamidimarri, K.K. Chin, W.O.K. Grabow, E.R. Hall, S. Ohgaki, D. Orhon, A. Milburn, C.D. Purdon ISBN: 0080430929 Publisher: Elsevier Science Ltd Pub. Date: 01 January, 1997 List Price: $22.01 Amazon.com Price: $22.01 |
24.
 |  | Title: Water Quality International '98 Part 2: Solid Wastes: Sludge and Landfill Management by W.O.K. Grabow, M. Dohmann, C. Hass, E.R. Hall, A. Lesouef, D. Orhon, A. Milburn, C.D. Purdon, P.T. Nagle, C. Haas ISBN: 0080433901 Publisher: Pergamon Press Pub. Date: 01 November, 1998 List Price: $159.00 Amazon.com Price: $159.00 |
25.
 |  | Title: Water Quality International '98 Part 3: Wastewater: Treatment Plants by W.O.K. Grabow, M. Dohmann, C. Hass, E.R. Hall, A. Lesouef, D. Orhon, A. Milburn, C.D. Purdon, C. Haas, A. van der Vlies ISBN: 008043391X Publisher: Pergamon Press Pub. Date: 01 November, 1998 List Price: $159.00 Amazon.com Price: $159.00 |