Use and conservation of the biosphere:Proc. Conf. of experts on the scientific basis for rational use , conservation of the resources of the biosphere paris 4-13 Sept. 1968
U.N.E.S.C.O.
Use and conservation of the biosphere:Proc. Conf. of experts on the scientific basis for rational use , conservation of the resources of the biosphere paris 4-13 Sept. 1968 - Paris UNESCO 1970 - 272
Environment
574.52
Use and conservation of the biosphere:Proc. Conf. of experts on the scientific basis for rational use , conservation of the resources of the biosphere paris 4-13 Sept. 1968 - Paris UNESCO 1970 - 272
Environment
574.52