ADVERTISEMENTS. 
The Ives Strata a" > Altitude Maps 
OF THÈ UNITED STATES AND PART OF CANADA. 
By James T. B. Ives, F. G. S., 
n Institute of Mining Engineers, the American 
mber o 
Association for d d ~ Saee, and the asadar Institute. 
THE STRATA MAP 
onsists of a series of seven Superimposed Maps, rep- 
resenting the seven Geological Syst the coun 
, col s recommended International Con 
gress of Geologists, portions iii c ay agreeably 
i ire 
It graphically exhibits sz sdhvcichon; denud- 
ation, and oute 
of escarpments, outliers, inliers, dip, strike, 
RERS etc., and the Cards may be bent 
show synclinal or anticlinal folds. 
rop of strata, with the phenom- 
THE ALTITUDE MAP 
usly published, the e being c 
ished ría refu 
Me ntain ees nces, br su uccessive altitudes are emphas 
in oak and psriahed, and arranged to hang on the 
The Map is beautifully A ose = fram 
wall or stand 
Map" differing from any QU Ba prev 
The two Mapo are ec aind in a neat cloth- PaA case, gilt lettered. 
Siz 0 
e, 21x15 inches. 
Pric 
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