56 THE PHYSICAL FEATURES OF CECIL COUNTY 



Uhler, P. E. Geology of the Surface Features of the Baltimore 

 Area. 



Johns Hopkins Univ. Cir. No. 21, vol. ii, 1883, pp. 52-53. 

 (Abst.) Science, vol. i, 1883, pp. 75-76, 277. 



Wilbur, F. A. Marls. 



Mineral Resources U. b., 1882, Washington, 1883, p. 522. 



Clay. 



Mineral Resources U. S., 1882, Washington, 1883, pp. 405-475. 



1884. 

 Adams, W. H. The Pyrites Deposits of Louisa County, Va. 

 Trans. Amer. Inst. Min. Eng., vol. xii, 1884, pp. 527-535. 

 Chester, Frederick D. The Quaternary Gravels of Northern Dela- 

 ware and Eastern Maryland, with map. 



Amer. Jour. Sci., 3rd ser., vol. xxvii, 1884, pp. 189-199. 



Huntington, J. H., Monroe, Chas. E., Singleton, H. K. De- 

 scriptions of Quarries and Quarry Eegions compiled from notes of 

 Messrs. Huntington, Monroe and Singleton. 



Tenth Census, vol. x, Washington, 1884, pp. 175-179. 



Smock, J. C. Geologico-geographical Distribution of the Iron Ores 

 of the Eastern United States. 



Eng. and Min. Jour., vol. xxxvii, New York, 1884, pp. 217-218, 230-232. 

 Trans. Inst. Min. Eng., vol. xii, 1884, pp. 130-144. 



Swank, James M. History of the Manufacture of Iron in all Ages. 

 Phila., 1884. 



1885. 



Chester, Frederick D. The Gravels of the Southern Delaware 

 Peninsula. 



Amer. Jour. Sci., 3rd ser., vol. xxix, 1885, pp. 36-44. 



Kunz, G. F. Precious Stones. 



Mineral Eesources U. S., 1883-84, Washington, 1885= 



1886. 



McGee, W J Geography and Topography of the head of Chesa- 

 peake Bay. (Eead to Amer. Assoc. Adv. Sci., 1886.) 

 (Abst.) Amer. Jour. Sci., 3rd ser., vol. xxxii, 1886, p. 323. 



Pumpelly, K. Geological and Geographical distribution of the Iron 

 Ores of the United States. 



Tenth Census, vol. xv, Mining Industries of the U. S., Washington, 1886, 

 pp. 3-36. 



