MosT contemporary literature on natural resources lies in the realm of physical science. Each of several dozen biological and earth sciences-aspects of geology, biology, hydrology, mineralogy, agronomy, oceanography, geography, and so on, deals with a defined sector or dimension of the natural universe. Each is concerned with improving knowledge and understanding of nature, without primary regard for the relation of such knowledge to social welfare and progress. Publications in these fields-inquiries in which nature, and not man, is the primary subject-are excluded from consideration here.