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Caption: "Lumber Flume -- on the Yosemite Merced Road," c. 1920. Flume with boards being carried by running water, likely along what is now known as California State Route 140, connecting the town of Merced with the Yosemite Valley.
Date: 1920
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Caption: "Alcatraz," c. 1920. Image of lighthouse, main prison building (at top of hill), residences, and wharf facilities at Alcatraz Island prior to its designation as a federal penitentiary in 1934. Built in 1859 by the U.S. Army for coastal defense purposes, the fort at Alcatraz began serving as a prison in 1861. It ceased function as a defense fortification and became the Pacific Branch of the U.S. Military Prison in 1907. Over the next two decades the facilities on the island were modified and modernized.
Date: 1920