by National Research Council of Canada Associate Committee on Scientific Criteria for Environmental Quality.;
Year: 1986., Callno: 632.954 PYR [Q]
Book
by Barnes, R. S. K.; Hughes, R. N.;
Year: 1988
Book
by Wulff, F. (ed.); Field, J. G. (ed.).; Mann, K. H. (ed.);
Year: 1989.
Book
by Lowe-McConnell, R. H.;
Year: 1987
Book
by O'Connor, Ruth; Kotlash, Amanda; Co-operative Research Centre for Freshwater Ecology (Australia).;
Year: 2005
Book
by Michael, Scott W.;
Year: 1998.
Book
by Pusey, B. J.; Storey, A. W.; Davies, P. M.; Edward, D. H. D.;
Year: 1989
Journal Article