Second Edition: Revised and Enlarged 



Source Book for the Economic 

 Geography of North America 



By CHARLES C. COLBY 



Associate Professor of Geography 

 in the University of Chicago 



5 The fundamental idea of the book is to make 

 available to the busy teacher the material on this 

 subject which is scattered widely through litera- 

 ture. The course which has been given for a 

 number of years at the University of Chicago 

 has resulted in the collection and organization of 

 the material most suitable for the purpose. 



5 The book contains short magazine articles 

 and materials from Canadian, Mexican, and 

 United States government publications. The 

 selection of the material has been governed by 

 the concept that there is a direct relation be- 

 tween the environment and the economic activ- 

 ities of the region. The author aims to survey 

 the different sections of the country from the 

 viewpoint of industrial opportunity. 



With chapter and maps on Alaska 

 Cloth, $3.00, postpaid $3.10 



The University of Chicago Press 



Chicago ... Illinois 



Studies in Minor Folds 



By CHARLES E. DECKER 



The author's purpose is to illustrate by diagrams 

 and photographs a series of types of minor folds; 

 to illustrate and study briefly a few minor folds in 

 their relation to major ones; to illustrate a larger 

 number of small folds in the midst of horizontal 

 or gently dipping strata, showing their character- 

 istics, methods of origin, age, and relation to 

 faults; and finally, to connect these minor 

 deformations, in so far as possible, with larger 

 movements, and show their significance, as 

 indicating the presence of compressional stresses 

 in the rocks in the interim between the great 

 periods of deformation and mountain-building. 



The data on which these studies are based have 

 been secured from a narrow area south of Lake 

 Erie, extending from Cleveland across north- 

 eastern Ohio, northwestern Pennsylvania, and 

 into New York as far as Dunkirk. A few folds 

 on Lake Ontario were studied, both in northern 

 New York and southern Canada. A few folds 

 were studied in the folded areas of the Arbuckle 

 and the Wichita Mountains of Oklahoma. 



Cloth; $1.50, postpaid $1.60 

 The University of Chicago Press 



Chicago - - . Illinois 



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The Study of Geological Maps. By Gertrude L. Elles, D.Sc, Fellow of Newn- 

 ham CoUege, Cambridge. Crown 4to. With 7 plates, 64 figures, and a map. Price on 

 application. Cambridge Geological Series. 



A Manual of Seismology. By Charles Davison, Sc.D. With loo illustrations. 

 Demy 8vo. Price on application. 



Petrology for Students: an Introduction to the Study of Rocks under 

 the Microscope. By Alfred Harker, M.A., F.R.S., F.G.S. Fifth edition, revised. 

 Crown 8vo. $3.75. 



A Treatise on Crystallography. By W. J. Lewis, M.A. Demy 8vo. $5.00. 



The Principles of Stratigraphical Geology. By J. E. Marr, Sc.D., F.R.S., F G.S. 



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An Introduction to Geology. By J. E. Marr, Sc.D., F.R.S., F.G.S. Crown 8vo. 



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