00426nam a22001811  4500001000800000005001700008008004100025010001700066040001800083041000800101043001200109080001700121082001700138100000700155101000800162245004400170504003000214169605420180301083722.0800122s1964    mduab    b    000 0 eng    a   64025069   aDLCcDLCdDLC  aeng  an-us---  a385.0973 FOG00a385.0973 FOG1 a52  aEKO10aRailroads and American economic growth:  aBibliography: p. 263-285.