Here are a terrific series of sketches, originally published in St Louis Commerce magazine in May of 1970.
The drawings are by George Conrey, who was head of the art department at the Post-Dispatch in the early 1960’s. The magazine itself was a periodical from what is now known as the St Louis Regional Chamber Of Commerce. It began publication way back in 1918, about the time George was graduating art school at Washington University. It ceased operations in 2012.