00922nam0-2200289---450-99000826178040332120100108134453.0000826178FED01000826178(Aleph)000826178FED0100082617820060124d1957----km-y0itay50------baengUSa-------001yyAmerican Commodity flowa geographical interpretation of rail and water traffic based on principles of spatial interchangeby Edward L. UllmanSeattleUniversity of Washington press1957XXII, 215 p.ill.23 cmStati UnitiTrasportiUllman,Edward Louis<1912-1976>318559ITUNINARICAUNIMARCBK990008261780403321K-06-063Ist. 6501ILFGEILFGEAmerican Commodity flow742192UNINA