GEOLOGICAL CORPS. 



CHARLES R. KEYES, STATE GEOLOGIST. 



E H. LONSDALE, ASS'T GEOLOGIST, C. F. MARBUT, ASS'T GEOLOGIST, 



Building Materials. Topography. 



H. A. WHEELER, ASS'T GEOLOGIST, ERASMUS HAWORTH, ASS'T GEOLOGIST 



Clays . Crystalline Rocks . 



E. L. CARTER, SECBETABY. 



