Quarterly of the Colorado School of Mines v. 16 no. 2 : The present status of the oil shale industry 1921
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From beginning of text: The past year is one in which no spectacular results have been obtained, but a year in which substantial and far reaching fundamental progress has been made. Effective legal progress has been made in securing valid title from the Government; extensive experimental work has been done on retorting; chemical investigation on the nature, properties, and behavior of oil shale has been carried on; the problems of refining shale oil have been taken up by oil refiners and chemists, and, finally, large financial interests, especially the oil and mining, have recognized that the ...