VI ADVERTISEMENT. 



Mineral Resources .if the United States, 1886, by David T.Day. 1887. 8°. viii, 813 pp. Price 



50 cents. 



Mineral Resources of the Iluitod St.ates, 1887, by David T.Day. 1888. 8'-. vii, 832 pp. Price 



50 cents. 



Mineral Re.sources of the United States, 1888, by David T.D.ay. 18!I0. 8'^. vii, 652 pp. Price 



50 cents. 



Mineral Resources of the United States, 1889 and WM, by Daviil T. Day. 1892. S^. viii, 671 pp. 

 Price 50 cents. 



Mineral Resources of the fnited States, 1891. by David T. Day. 1893. 8°. vii, 6o0 pp. Price 

 50 cents. 



The money received from tjjc sale of these ]iulilicatious is deposited in the Treasury, and the 

 Secretary of that Department declines to receive liauk <-liccks, drafts, or postaise-stamps; all I'cmit- 

 tances, therefore, must lie liy I'osTVL NOTE or MONKY OKiiEii, made payal)le to the Chief Clerk of the 

 U. S. (Jecdoifical Survey, or in criiUEN'CV for the exact amount. Correspoudeuce relating to the pub- 

 lications of the Survey should be addressed 



To THE Director of the 



United States Geologicat. Strtvey, 



Washington, D. C. 

 Washington, D. C, SeptcmVcr, 1893. 



