ECONOMIC GEOLOGY 
OF THE 
UNITED STATES, 
WITH BRIEFER MENTION OF FOREIGN MINERAL PRODUCTS. 
By RALPH S. TARR, B.S., F.G.S.A., 
Assistant Professor of Geology at Cornell University. 
Second Edition. Revised. $3.50. 
COMMENTS. 
*“*T am more than pleased with your new ‘ Economic Geology of the United 
States.” An introduction to this subject, fully abreast of its recent progress, and 
especially adapted to American students and readers, has been a destderatum. The 
book is admirably suited for class use, and I shall adopt it as the text-book for instruc- 
tion in Economic Geology in Colorado College. It is essentially accurate, while 
written in a pleasant and popular style, and is one of the few books on practical 
geology that the general public is sure to pronounce ~eadaéle. The large share of 
attention given to non-metallic resources is an especially valuable feature.” — FRANCIS 
W. Crain, Professor of Geology, Mineralogy, and Paleontology at Colorado 
College. 
‘*T have examined Professor R. S. Tarr’s ‘Economic Geology’ with much 
pleasure. It fills a felt want. It will be found not only very helpful to students and 
teachers by furnishing the fundamental facts of the science, but it places within easy 
reach of the business man, the capitalist, and the statesman, fresh, reliable, and com- 
plete statistics of our national resources. The numerous tables bringing out in an 
analytic way the comparative resources and productiveness of our country and of 
different states, are a specially convenient and admirable feature. The work is ea 
interesting demonstration of the great public importance of the science of geology.” 
— James E. Topp, State Geologist, South Dakota. 
*‘It is one of those books that is valuable for what it omits, and for the concise 
method of presenting its data. The American engineer has now the ability to acquire 
the latest knowledge of the theories, locations, and statistics of the leading American 
ore bodies at a glance. Were my course one of text-books, I should certainly use it, 
and I have already called the attention of my students to its value as a book of 
reference.” —Epwarp H. Wititams, Professor of Mintng, Engineering, and 
Geology at Lehigh University. 
“‘T have taken time for a careful examination of the work; and it gives me 
pleasure to say that it is very satisfactory. Regarded simply as a general treatise 
on Economic Geology, it is a distinct advance on anything that we had before; while 
in its relations te the Economic deposits of this country it is almost a new creation 
and certainly supplies a want long and keenly felt by both teachers and general 
students. Its appearance was most timely in my case, and my class in Economic 
Geology are already using it as a text-book.” —WiL.iiam O. Crossy, Assistant 
Professor of Structural and Economic Geology at the Massachusetts Institute of 
Technology. 
THE MACMILLAN COMPANY, 
66 FIFTH AVENUE, NEW YORK. 
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