Sources

	Product	Relevant Links
THE HISTORICAL MARKER DATABASE	California, New York City, San Francisco, Seattle, United States, University of California, Berkeley, Vancouver, World	https://www.hmdb.org/
Sources of Images	California, New York City, San Francisco, Seattle, United States	https://slicesofbluesky.com/public-domain-images/
History of San Francisco	San Francisco	https://en.wikipedia.org/wiki/History_of_San_Francisco

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