found: Map of the city of Oakland ... 188-:map recto (lith. H.S. Crocker & Co., S.F.)
found: Birds eye view of Reno, Nevada, 1890(H.S. Crocker & Co.)
found: LC data base, 12-19-85(hdg.: Crocker (H.S.) Company, San Francisco)
found: Bloodgood, D. A pic-tour map of Washington D.C., c1952:map recto (H.S. Crocker Co., Inc., San Francisco)
found: Duke University Libraries website, Dec. 20, 2010(Guide to the Strobridge Lithographing Company Advertisements, 1910-1954 and undated: 1880, The firm changed its name to "The Strobridge Lithographing Company"; 1960, H. S. Crocker, Inc. acquired Strobridge Lithographing Co. (listed as division until 1970))
notfound: The Amazing American Circus Poster, 2011, ©2011: CIP t.p. (Strobridge Lithographing Company) galley (Strobridge and Company and later the Strobridge Lithographing Company)
found: McClelland, G. California Orange Box Labels .. 1995:page 114 (Crocker and Union formally combined to form Crocker-Union in 1936 and then readopted the the original H.S. Crocker name in 1946)
found: San Francisco City Directory, 1899, via ancestry.com 17 October 2013:page opposite 1278 (Mutual Label & Lithographic Co.; Successors to Schmidt Label & Litho Co, Dickman Jones Co, H.S. Crocker Co [Litho. Dep't.])
