Abstract
Sachs, L. (1970). Statistische Methoden, Ein Soforthelfer. Dansereau, Pierre (Ed.) (1970). Challenge for Survival: Land, Air and Water for Man in Megalopolis. 9½× 6 in. Electrical Energy Needs and Environmental Problems, Now and in the Future. Edmondson, W. T. and Winberg, G. G. (Eds) (1971). A Manual on Methods for the Assessment of Secondary Productivity in Fresh Waters.
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