by Ryding, S.-O. (ed.), Rast, W. (ed.)
Published in Man and the Biosphere Series (UNESCO) (1989)

by Loehr, R.C. (ed.), New York State Coll. of Agriculture and Life Sciences, Ithaca (USA) eng, Conference on Phosphorus Management Strategies for Lakes eng 1979 (Ithaca?), N.Y. (USA), Martin, C.S. (ed.), Rast, W. (ed.)
Year of Publication 1980