This was once a two-story house

 Estados Unidos > California > Los Angeles County > Los Angeles

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Photograph caption dated December 5, 1947 reads, "Splinters and rubble are all that's left of two-story home at 2002 Virginia road today after fumes of deadly cyanide gas being used to fumigate building exploded. Three workers were injured, one of them blown through wall of home into house next door."