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Dear Mr. Izutsu,
Thank you for posting your request on History Hub!
Many small businesses declared bankruptcy during the 1930s (see article). We searched the National Archives Catalog for bankruptcy records in the Records of District Courts of the United States (Record Group 21) and located 3125 series. If you know the state where the bankruptcy took place, please consult NARA’s web page about court records to determine which NARA facility has the case you seek.
We hope this information is helpful. Best of luck with your research!