The previous part of Magazine Management's August 1965 issue of Popular Jokes can be found last Thursday. It's too complicated to link to the past few installments of these gags, so check the archive somewhere on the right.
I don't know much about Walt Munson, but I do know that the publisher got gags cheaply from other countries for use in some of their magazines.
That's Quick Draw McGraw! It's alright! -
10 minutes ago