Earthbound : minerals, energy, and man's future / Charles F. Park, Jr., in collaboration with Margaret C. Freeman. Park, Charles Frederick, 1903- Freeman, Margaret C. Mines and mineral resources. Power resources. HD9506.A2 P37 1975 549 PAE Includes index. Bibliography: p. [265]-268. San Francisco : Freeman, Cooper, c1975. c1975. 1974 Text 279 p. : eng