The J. Paul Getty Museum
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The J. Paul Getty Museum: image dedicated to the public domain under Creative Commons Zero (CC0), stated on the media record itself ('Rights for Media'), with download clearance.
Carleton Watkins. ["The Lake" - Yo Semite Valley] / [Lake Bank] / [Lake Ah-Wi-Yah, Yosemite] / [Mirror Lake and Mt. Watkins, Yosemite], negative 1861; print about 1867. The J. Paul Getty Museum.