| Thomas Houseworth Backmark for "Lawrence & Houseworth, 317 & 319 Montgomery St, San Francisco." n.d. Carte de visite, back UCR - University of California, Riverside Gift of Mr. Richard N. Pitman, Accession Number: 2007.0032.0009 LL/75929 Front: A Walk among the Big Trees, Mammoth Grove, Calaveras County
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