Some sample cartoons to be submitted to the local newspaper when trying to get support for an expensive water projects.
There are a few clues to the age. First, the organization that created the guide was the “cast iron pipe research association” which no longer exists.
Second, and more Oppo relavent. It contains pictures of work trucks used in some outreach programs.
I can’t ID all the trucks, but the one on the left in the first picture looks like a 1958 Chevy.