A SURVEY OF THE FERTILIZER IISTDUSTRY. 29 



Potash from kelp and alunite, sugar manufacture, cement, etc. U. S. Geol. Surv., 



Press Bui. 366, p. 3-4. May, 1918. 

 Potash, Domestic Production of, in 1918. U. S. Geol. Surv., Press Bui. 399, p. 1. 



February, 1919. 

 Ross, W. H. The extraction of potash from silicate rocks. Soils Circ. 71. 10 p. 1912. 

 Ross, WilHam H., Merz, Albert R., and Wagner, C. R. The recovery of potash as a 



by-product from the cement industry. Dept. Bui. 572. 23 p. 1917. 

 Skinner, J. J., and Jackson, A. M. Alunite and kelp as potash fertilizers. Soils 



Circ. 76. 5 p. 1913. 

 Stockett, A. W. The potash situation, Bureau of Mines, "War Minerals Investigations 



Series No. 2. 13 p. 1918. 

 Turrentine, J. W. The occurrence of potassium salts in the salines of the United 



States. Soils Bui. 94. 96 p. 1913. 

 Waggaman, William H. Alunite as a source of potash. Soils Circ. 70. 4 p. 1912. 

 Waggaman, William H. The production and fertilizer value of citric-soluble phos- 

 phoric acid and potash. Dept. Bui. 143. 12 p. 1914. 

 Waggaman, W. H., and Cullen, J. A. The recovery of potash from alunite. Dept. 



Bui. 415. 14 p. 1 fig. 1916. 

 Young, G. J. Potash salts and other salines in the Great Basin region. Dept. Bui. 61. 



96 p. 8 fig. 1914. 



SULPHUR. 



Smith, Philip S. Our mineral supplies — sulphur. U. S. Geol. Surv. Bui. 666-B. 



[1917] p. 7-10. 

 Smith, Philip S. Sulphur, pyrite and sulphuric acid in 1916. U. S. GeoL Surv., 



Mineral resources of the United States, 1916, pt, 2:28, p. 403-432; 1917, pt. 2:4, 



p. 19-62. 

 Stone, R. W. Our mineral supplies — gypsum. U. S. Geol. Surv. Bui. 666-E. 



[1917] 3 p. 

 Waggaman, William H. The production of sulphiulc acid and the proposed new 



method of mantifacture. Dept. Bui. 283. 39 p. 1 fig. 1915. 



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