1.

図書
図書
1. Changes in labor cost during cycles in production and business
Thor Hultgren
出版情報: New York : National Bureau of Economic Research, 1960
シリーズ名: Occasional paper / National Bureau of Economic Research ; 74
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2.

図書
図書
2. Transport and the state of trade in Britain
Thor Hultgren ; assisted by William I. Greenwald
出版情報: New York : National Bureau of Economic Research, 1953
シリーズ名: Occasional paper / National Bureau of Economic Research ; 40
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3.

図書
図書
3. Cost, prices, and profits : their cyclical relations
Thor Hultgren ; assisted by Maude R. Pech
出版情報: New York : National Bureau of Economic Research : Distributed by Columbia University Press, 1965
シリーズ名: Studies in business cycles ; no. 14
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4.

図書
図書
4. American transportation in prosperity and depression
Thor Hultgren
出版情報: New York : National Bureau of Economic Research, c1948
シリーズ名: Studies in business cycles ; no. 3
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