Chapter 3.1
U.S. National Resources Planning Board (1935): Maps
Undeveloped Waterpower Areas
Major Interstate Water Problems
Possible Planning Regions based upon major metropolitan influence
Possible Planning Regions based upon administrative convenience
National Resources Board Planning Districts based upon group-of-states arrangement
National Resources Board Water Regions Based upon a Single Function
Possible Planning Regions based upon composite planning problems
Areas Proposed For Improvement Authorities