Social Science and National Economy by Robert Ellis Thompson

"It might be easily and fairly elaborated into an economical history of the earth, for that history is nothing but the story of man's conquest of nature's resistance and the progressive mastery of her manifold utilities"

Roads, Rails, & Waterways: The Army Engineers and Early Transportation by Forest G. Hill

"Transportation is the lifeblood of a nation. Without adequate transportation facilities, no country can achieve its full economic potential."