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Testimony of Detective John O'Brien (May 18)
- Public Hearings - Riot (May 1935), 61, Subject Files, Box 410, Folder 7 (Roll 195), Records of Mayor Fiorello H. La Guardia, 1934-1945 (New York City Municipal Archives).
- Public Hearings - Riot (May 1935), 64, Subject Files, Box 410, Folder 7 (Roll 195), Records of Mayor Fiorello H. La Guardia, 1934-1945 (New York City Municipal Archives).
- Public Hearings - Riot (May 1935), 65, Subject Files, Box 410, Folder 7 (Roll 195), Records of Mayor Fiorello H. La Guardia, 1934-1945 (New York City Municipal Archives).
- Public Hearings - Riot (May 1935), 67, Subject Files, Box 410, Folder 7 (Roll 195), Records of Mayor Fiorello H. La Guardia, 1934-1945 (New York City Municipal Archives).
- Public Hearings - Riot (May 1935), 71-2, Subject Files, Box 410, Folder 7 (Roll 195), Records of Mayor Fiorello H. La Guardia, 1934-1945 (New York City Municipal Archives).