Human environments and natural systems : a conflict of dominion / by Ned H. Greenwood and J. M. B. Edwards. Greenwood, Ned H. Edwards, J. M. B., joint author. Human ecology. Environmental protection. Land use Environmental aspects. GF41 .G73 711 GRH Bibliography: ( p. 395-407). and index. California : Duxbury Press , c1973 . c1973 . 1973 Text xii, 429 p. : eng