TY  - BOOK
AU  - Bigham,Truman C.
AU  - Roberts Merrill J. 
TI  - Transportation : : principles and problems 
U1  -  388 23
PY  - 1952///
CY  - New York
PB  - McGraw-Hill
KW  - Transportation
KW  - United States
N1  - Include index
ER  -