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Testimony of Detective John O'Brien (April 20)
- Public Hearings - Outbreak (March-April 1935), 179-80, Subject Files, Box 408, Folder 8 (Roll 194), Records of Mayor Fiorello H. La Guardia, 1934-1945 (New York City Municipal Archives).
- Public Hearings - Outbreak (March-April 1935), 182, Subject Files, Box 408, Folder 8 (Roll 194), Records of Mayor Fiorello H. La Guardia, 1934-1945 (New York City Municipal Archives).
- Public Hearings - Outbreak (March-April 1935), 183, Subject Files, Box 408, Folder 8 (Roll 194), Records of Mayor Fiorello H. La Guardia, 1934-1945 (New York City Municipal Archives).
- Public Hearings - Outbreak (March-April 1935), 184-85, Subject Files, Box 408, Folder 8 (Roll 194), Records of Mayor Fiorello H. La Guardia, 1934-1945 (New York City Municipal Archives).
- Public Hearings - Outbreak (March-April 1935), 186, Subject Files, Box 408, Folder 8 (Roll 194), Records of Mayor Fiorello H. La Guardia, 1934-1945 (New York City Municipal Archives).
- Public Hearings - Outbreak (March-April 1935), 187-89, Subject Files, Box 408, Folder 8 (Roll 194), Records of Mayor Fiorello H. La Guardia, 1934-1945 (New York City Municipal Archives).