found: Airship Brand. [graphic], 1930-1940:image recto (Crocker-Union, L.A.)
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) page 116 (Crocker-Union San Francisco)
found: Printers' Ink, vol. 175, 1936:page 90 (Now Crocker-Union; The H. S. Crocker Company Inc., eighty-year old California printing concern, has changed its name to Crocker-Union. The change is to bring under the identity of a single name the Crocker Company and its affiliate, the Union Lithograph)