| Unidentified photographer Photograph of the Effect of Earthquake on Houses Built on Loose or Made Ground After the 1906 San Francisco Earthquake 1906 Gelatin silver print National Archives and Records Administration ARC Identifier 2127357 LL/43797 Records of the United States Senate; Record Group 46; National Archives.
Considered one of the worst natural disasters in U.S. history, the San Francisco Earthquake struck on the morning of April 18, 1906.
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