Original poster, approximately 24" x 35", from AT&T "Telephone Courtesy" for kids.

These were given to schools/teachers with a lesson plan for kids in early (K-3) years. 

"Don't Roar" "Speak with your normal voice. Roaring is for lions, not humans"; "Don't Hog" (with a hog) "Somebody else might want to use the phone;" and so on.
The monkey for "Don't Monkey" "Playing with the telephone can put it out of order" looks VERY MUCH like Curious George, but there's no copyright or other information indicating it is.

The poster was originally folded and is now rolled. There is a split along the left edge, along the center fold. Item will be shipped rolled.  Should mount & matte very nicely.
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 Thanks for looking!

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Location: Box P3