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＜図書＞
Cost data for the management of railroad passenger service

出版者	Boston : Harvard University, Graduate School of Business Administration, Division of Research
出版年	1957
大きさ	345 p. 22 cm.
著者標目	Ladd, Dwight R
件　名	Railroads -- United States -- Passenger traffic  全ての件名で検索
一般注記	Includes bibliography.

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