Maker: Specialty Incentives Denver CO (Ebay: Carl's Match Covers)
The circular symbol no doubt represents cooperation or unity although it also resembles two or more people fighting over a steering wheel.
Maker: Unknown (Matchcover Collector: Taxi & Cabs)
This matchbook gives the boundaries of the 20-, 30- and 40-cent fare zones then operative in Denver. William F. (Bill) Marlar, an aerospace enthusiast, was incapacitated in a robbery. His memorial foundation supports aerospace research.