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Kennedy Library Online Archive: Search across thousands of records from Special Collections and Archives. Try keywords including the names of the morros, or "aerial" or "panorama."
Selected examples:
Early hand-drawn maps of California ranchos
These maps, located at the Bancroft Library at UC Berkeley, depict ranchos properties in California.
Calisphere
Search across many California archives' digitized materials on Calisphere.
Visit the History Center to learn more about their collections, or search their online collections to see what they have digitized.