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＜図書＞
Business barometers used in the accumulation of money; a text book on applied economics for merchants, bankers and investors / Roger W. Babson.

版	(15th ed.)
出版者	Wellesley Hills, Mass. : Babson service co.
出版年	{c1921}
大きさ	436 p., {9} p. illus. 19 cm.
著者標目	Babson, Roger Ward, 1875-1967
件　名	Business United States -- Economic conditions  全ての件名で検索

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