VI ADVERTISEMENT. 
Mineral Resources of the United States, 1886, by David T. Day. 1887. 8°. viii, 813 pp. Price 
50 cents. 
Mineral Resources of the United States, 1887, by David T. Day. 1888. 8°. vii,832 pp. Price 
50 cents. 
Mineral Resources of the United States, 1888, by David T.Day. 1890. 8°. vii,652 pp. Price 
50 cents. 
‘ Mineral Resources of the United States, 1889 and 1890, by David T. Day. 1892. 8°. viii, 671 pp. 
Price 50 cents. 
Mineral Resources of the United States, 1891, by David T. Day. 1893, 8°. vii, 630 pp. Price 
50 cents. ; 
The money received from the sale of these publications is deposited in the Treasury, and the 
Secretary of that Department declines to receive bank checks, drafts, or postage-stamps ; all remit- 
tances, therefore, must be by POSTAL NOTE or MONEY ORDER, made payable to the Chief Clerk of the 
U.S. Geological Survey, or in CURRENCY for the exact amount. Correspondence relating to the pub- 
lications of the Survey should be addressed 
To THE DIRECTOR OF THE 
‘ UNITED STATES GEOLOGICAL SURVEY, 
WASHINGTON, D. C, 
WASHINGTON, D. C., September, 1893. 
