Thank you, I will follow the leads. And yes, the 'Buchan Bakers' were sponsored through the bakery. The authors were Bruce Kitts (my cousin) and Robin Buchan (my father), the youngest of the founders children. I have become the collector of bakery artifacts in the family and have all the old bread wrappers ready to put in the truck, whenever I find it...Thank you for your help, this has been a great learning adventure.
On another note, I have attached an advertisement for a 1937 International Bakery delivery truck to the photos which you will find is quite similar.