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. 



9 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 

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THE ORIGIN OF THE EARTH 



By THOMAS C. CHAMBERLIN 



Professor Emeritus in the Department of Geology 

 The University of Chicago 



One of "The University of Chicago Science Series" 



FROM THE PREFACE 



"In telling the story of this search for the mode by which the earth came 

 into being, we have let the incidents that led the inquiry on from one stage to 

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 purposes of this series of booklets that the motives which set researches going 



should have their place with the quests that arose from them The final 



story of the birth of the earth will come only after a time, when the vestiges of 

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