Human Energy Production as a Process in the Biosphere S. Fred Singer Scientific American, Vol. 223, No. 3, September 1970, 175-190   TO PRINT ⇒  175 176 178 183 184   TO VIEW ⇒  175 176 178 183 184   TO PRINT ⇒  186 187 188 190   TO VIEW ⇒  186 187 188 190 110527

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