1.

図書
図書
1. Employment hours and earnings in prosperity and depression : United States, 1920-1922. 2nd ed
by Willford Isbell King
出版情報: Ann Arbor, Mich. : University Microfilms, 1923
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2.

図書
図書
2. Income in the United States : its amount and distribution, 1909-1919 (v. 1 ; v. 2)
by the staff of the National Bureau of Economic Research, incorporated, Wesley C. Mitchell ... [et al.]
出版情報: Ann Arbor, Mich. : University Microfilms, c1921-c1922
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目次情報:
v. 1. Summary
v. 2. Detailed report
v. 1. Summary
v. 2. Detailed report