Here are links to 3 Texaco collector and marketing history books. Your questions will be answered in the information and many photos in these books.
* Texaco Collectibles : With Price Guide by Robert W.D. Ball
http://www.amazon.com/exec/obidos/ISBN%3D0887406564/primarilypetroli
* Texaco Collector's Guide by Scott Benjamin, Wayne Henderson
http://www.amazon.com/exec/obidos/ISBN%3D076030291X/primarilypetroli
* A Tour With Texaco by Rick Pease
http://www.amazon.com/exec/obidos/ISBN%3D0764303600/primarilypetroli
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Thanks, Jim