TY  - BOOK
AU  - Ringwalt J. L.
TI  - Development of transportation systems in the Unite
T2  - History of American economy : Studies and materials for study
U1  - X4:73:M8, B8.2 
PY  - 1808///
CY  - New York
PB  - Johnson Reprint Corporation       
KW  - Transport Economics  -- United States
N1  - Reprinted : New York, Johnson Reprint Corporation, 1965
ER  -