301.31
V217U
           Van Dobben, W H (Ed)
               Unifying concepts in ecology report of the plenary sessions of the first international congress of ecology, the hague,the Netherlands,September 8-14, 1974 \ W H Van Dobben - Hague : W. Junk B V, 1975.
               302p.
                ISBN: 90-6193-174-6

97770
                Subjects: Environmentalism; Ecology; Ecological surveys; Ecology-Research.