United States. President's Research Committee on Social Trends
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| コード類 | 典拠ID=AU00002984 NCID=DA03914104 |
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| 1 | Recent social trends in the United States : report of the President's Research Committee on Social Trends / with a foreword by Herbert Hoover v. 1,v. 2. - New York : McGraw-Hill , 1933 |