@book{159753,
	author = {Biological Methods for the Assessment of Water Quality,  and Cairns, John. and American Society for Testing and Materials.},
	title = {A symposium on biological methods for the assessment of water quality presented at the seventy-fifth annual meeting, American Society for Testing and Materials. /},
	publisher = {American Society for Testing and Materials,},
	year = {c1973.},
	address = {Philadelphia :}
}