"1930's" meaning in English

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  "lang_code": "en",
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          "ref": "1956, Harry S. Truman, chapter 19, in Memoirs of Harry S. Truman: Years of Trial And Hope, volume II, Doubleday & Company, →OCLC, page 274:",
          "text": "During this period the American people were undergoing great economic and social reforms brought on by the economic and financial collapse of the 1930's.",
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        {
          "ref": "1969, John Gardner, “Urban Bureaucratic Elite in Communist China”, in A. Doak Barnett, editor, Chinese Communist Politics in Action, University of Washington Press, →LCCN, →OCLC, page 221:",
          "text": "Supported by the rich supply of iron ore and coal from the neighboring towns of Tayeh and Huangshih, a major industrial complex had grown up by the 1930’s.",
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        "Alternative form of 1930s"
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  "word": "1930's"
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  "lang_code": "en",
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          "ref": "1969, John Gardner, “Urban Bureaucratic Elite in Communist China”, in A. Doak Barnett, editor, Chinese Communist Politics in Action, University of Washington Press, →LCCN, →OCLC, page 221:",
          "text": "Supported by the rich supply of iron ore and coal from the neighboring towns of Tayeh and Huangshih, a major industrial complex had grown up by the 1930’s.",
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