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Reference - History - U.S. Census Bureau
Patent US1039789 - Check-perforator. - Google Patents
page mfg. co san francisco chronicle building - Google Search
The SF Chronicle Building Restored | San Francisco History | Guidelines Newsletter
Tracking down San Francisco’s top-secret denim factory - SFGate
Patent US1039789 - Check-perforator. - Google Patents
Seamaid Manufacturing - Google Maps
San Francisco Chronicle - Google Maps
690 Market St - Google Maps
S.F.'s restored de Young building stunning at street level - SFGate
"de young building page mfg. co 1912" - Google Search