Hewett, The
American Traveller; or, National Directory Containing an Account of
all the Great Post-Roads and Most Important Cross-Roads in the
United States (Washington, 1825). The best estimate of the
significance of internal improvements in this period is G. S.
Callender, "Early Transportation and Banking Enterprises of the
States in Relation to the Growth of Corporations," in Quarterly
Journal of Economics, XVII., 3-54. A useful history of federal
internal improvement legislation is H. G. Wheeler, History of
Congress (1848), II., 109-513. J. L. Ringwalt, Development of
Transportation Systems in the United States (1888), a summary but
valuable account; H. V. Poor, Sketch of the Rise and Progress of
Internal Improvements, in his Manual of the Railroads of the United
States for 1881.
Official Publications.--Especially significant are: Niles' Register,
XXXVI., 168, a statement of the amount of money expended in each
state and territory upon works of internal improvement to October 1,
1828; J.
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