xvi PREFACE 



He has given substantial aid in planning the book, in assembling 

 and interpreting the complex materials and points of view in 

 the broad field of land use, and in orienting the author's field 

 investigations. These studies in the field on the part of the 

 author involved more than 19,000 miles of travel to all parts 

 of the United States, for purposes of first-hand observation 

 and consultation with experts in all phases of land use. 



A. B. 



