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Page, L. W. 



Object Lesson Roads. In Yearbook of United States Department of 

 Agriculture, 1906. 



Pabsons, C. L. 



Notes on Mineral Wastes. In Bulletin No. 47, United States Bureau of 

 Mines, 1912. 



Richards, R. H. 



A Textbook of Ore Dressing, 1909. 



RiES, Heinrich. 



Economic Geology, 1910. 



Shannon, C. W. 



Roads and Road Materials of Monroe County. In Indiana Department 

 of Geology and Natural Resources, SOth Annual Report, 1905. 



Spoon, W. L. 



Sand-Clav and Earth Roads in the Middle West. In Circular No. 91, 

 United States Office of Public Roads, 1910. 



Storer, F. H. 



Agriculture, 2 vols., 1889. 



Thorp, F. H. 



Outlines of Industrial Chemistry, 1905. 



Vivian, Alfred. 



First Principles of Soil Fertility, 1912. 



Wing, C. B. 



The Necessity of Lime in Growing Alfalfa. In Transactions of National 

 Lime Manufacturers' Association, 1909. 



Manufacture of Cement and Lime 



Bassler, R. S., and Eckel. E. C. 



Cement Resources of Virginia West of the Blue Ridge. In Virginia 

 Geological Survey, Vol. iia, 1909. 



Beyer, S. W. 



Physical Tests of Iowa Limes. In Iowa Geological Survey, Vol. xvii, 1906. 



Beyer, S. W., and Williams, Ira A. 



Quarry Products of Iowa. In Iowa Geological Survey, Vol. xvii, 1906. 



Blatchley, W. S. 



Portland Cement in Indiana. In Indiana Department of Geology and 

 Natural Resources, 25th Annual Report, 1900. 



Bleininger, a. v., Lines, E. F., and Layman, F. E. 



Illinois Portland Cement Industrv. In Bulletin No. 17, Illinois Geological 

 Survey, 1912. 



BUEHLER, A. H. 



Lime and Cement Resources of Missouri. In Missouri Geological 

 Survey, Vol. vi, 1907. 



Chatelier, H. Le. 



Recherches experimentales sur la Constitution des Mortiers 

 Hydrauliques, 1887. 



Clapp, F. G. 



Limestones of Southwestern Pennsylvania. In Bulletin No. 249, United 

 States Geological Survey, 1905. 



Eckel, E. C. 



American Cement Industry. In Bulletin No. 260, United States Geolog- 

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