OUTLOOK FOR IRON KEMP. 309 



1909. J. G. Butler and John Birkinbine. Brief filed with the Finance Committee 



of the United States Senate in 1909 (cited in E. C. Eckel's " Iron Ores," 

 p. 347, in 1914). 

 C. W. Hayes. " Iron Ores of the United States," in Papers on the Con- 

 servation of Mineral Resources, Bulletin 394, U. S. Geological Survey, 

 pp. 70-114. 



1910. James F. Kemp. " Iron Ore Reserves in the United States," in " Iron 



Ore Reserves of the World," vol. 2, pp. 753-778, Eleventh International 

 Geological Congress, Stockholm, 1910. 

 James F. Kemp. Discussion of the question: What shall the iron in- 

 dustry of the future do for ore? Symposium of representatives af six 

 chief producing nations, Sweden, Spain, France, Germany, Great 

 Britain, and the United States, Eleventh International Geological Con- 

 gress, Stockholm, 1910, Compte Rendu, I, 321-328. Mining Magazine, 

 London, Nov., 1910, 363-367. 



1911. C. R. Van Hise, C. K. Leith, and W. J. Jlead. " Reserves in the Lake 



Superior District," Monograph 52, U. S. Geological Survey, pp. 488- 

 495, 1911. 

 3914. E. C. Eckel. "Iron Ores, Their Occurrence, Valuation, and Control," 

 p. 430, fig. 66, New York, 1914, especially pt. 4, pp. 339-427. 

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