Detail from: Untitled [Sunnyside Powerhouse, San Francisco] 1892c. San Mateo County Historical Association Collection (1990.48). Used with permission and subject to usage restrictions.

Detail from: Untitled [Sunnyside Powerhouse, San Francisco] 1892c. San Mateo County Historical Association Collection (1990.48). Used with permission and subject to usage restrictions.

Detail from: Untitled [Sunnyside Powerhouse, San Francisco] 1892c. San Mateo County Historical Association Collection (1990.48). Used with permission and subject to usage restrictions.

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