01056nam0 2200229 450 00001562720190226123835.020080828d1923----km-y0itay50------baitaITy-------001yy<<The >>history of export and import railroad rates and their effect upon the foreign trade of the United Statesa thesis in economics presented to the Faculty of the graduate school of the University of Pennsylvania in partial fulfillment of the requirements for the degree of doctor of phylosophyby Roland Laird KramerPhiladelphiaWestbrook publishing1923120 p.23 cmFerrovieStati uniti d'America38520Trasporti ferroviariKramer,Roland Laird267980ITUNIPARTHENOPE20080828RICAUNIMARC000015627DEP I-03361577NAVA42008History of export and import railroad rates and their effect upon the foreign trade of the United States677074UNIPARTHENOPE