Campbell's "66" Express
Springfield, MO
MC-075320 DoT 81783
Ceased operations 1986.
Facebook - Campbell 66 Express
Gemini Shippers - FreightWaves Haul of Fame: For 60 years Campbell’s “66” Express was “Humpin’ to Please”
YouTube - Campbell's 66 Express: Humpin to Please!!
YouTube - Rt. 66: Greg Gaszak, August 11, 2018
YouTube - Rt. 66: Bruce Crim, August 18, 2017
US Trademark
Route Map - Spring 1961
Profiled in Mike Terebecki's The Vanishing Trucking Pioneers Book (click image to see Book index)
Acquisitions
Patches of it that are in my project - Facebook Trucking Industry Insignia Patches
Other known patches
If you want your own memoribilia:
Campbell"66" Express items available on eBay
Note that patches sold by "freedomfifty2k" and "bob82ndabn325inf"are likely promo/replica patches, not patches actually used by the company represented.