Previous to the emergence of man, the earth was replete with fertile soil, with trees and edible fruits, with rivers and waterfalls, with coal beds, oil pools, and mineral deposits; the forces of gravitation, of electro-magnetism, of radio-activity were there; the sun sent forth his life-bringing rays, gathered the clouds, raised the winds; but there were no resources.
~ Erich Zimmermann, World Resources and Industries (1933), p. 3
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