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File:San Francisco and Bay counties telephone directory (1917) (14570000260).jpg - Wikimedia Commons
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California - White Pages and Yellow Pages - Alameda County - March 1935 thru March 1946 | Library of Congress
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Southern California Japanese Telephone & Business Directory / Nanka Nihonjin denwacho: No. 22 1933 | H. Ichinose
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California - White Pages and Yellow Pages - Los Angeles Extended Area - December 1940 | Library of Congress
Telephone directory, San Francisco, 1878 : American Speaking Telephone Company : Free Download, Borrow, and Streaming : Internet Archive
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State of California Telephone Directory, January 1897 : Pacific Telephone and Telegraph Company : Free Download, Borrow, and Streaming : Internet Archive
Petaluma, Sonoma, Lake and Mendocino counties, California, telephone directory, 1927, November — Calisphere
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