Nielsen, David. text Chelsea, Mich Lewis Publishers c1991 monographic x, 717 p. : ill., maps ; 25 cm. edited by David M. Nielsen. Includes bibliographical references and index. Environmental Technology. Sanitary engineering Technology TD426 .P73 1990 628.1/61 0873711246 90036848 UOEL 000 20170720161329.0 581712