00303nam a2200109Ia 4500082002500000100001700025245007400042260005200116300001500168500000500183700000500188  a309.5150973bF655.RA  aFogel, R. W.  aRailroads and American economic growthbessays in econometric history  aBaltimorebJohns Hopkins University Pressc1964  axvi, 296p.  a  a