xii PREFACE 



by the authors. Many others, however, have kindly 

 assisted in furnishing views suitable for use. Special 

 acknowledgments are due the following: Frank H. 

 Shoemaker; R. A. Lindsay; Physiographic Labora- 

 tory, Cornell University ; H.J. Young; E. L. Currier; 

 Holt Manufacturing Company ; New York State Board 

 of Agriculture ; Pennsylvania Railway; Norfolk and 

 Western Railway; International Harvester Company; 

 Washburn-Crosby Mills ; Loose- Wiles Biscuit Com- 

 pany ; New Seattle Chamber of Commerce ; Canadian 

 Pacific Railway; Winnipeg Grain Exchange; Pan- 

 American Union (views on Argentina) ; Department 

 of Agriculture, New South Wales, Australia (views on 

 Australia). 



The authors are indebted to Mr. E. D. Kiddoo for 

 the preparation of the index. 



N. A. BENGTSON. 



DONEE GRIFFITH. 



