Borensten, Isreal , 1919- Capital and output trends in mining industries, 1870 - 1948 - New York: National Bureau of Economic Research, 1954 - 81p. ; 23 cm - National Bureau of Economic Research ; Occasional paper 45 . Subjects--Topical Terms: Mining industry and finance--United States Dewey Class. No.: PS 330.97306273 N37