Letters credit from Todd Klein via his Klein Letters blog (18 September 2016, http://kleinletters.com/Blog/ira-schnapp-in-worlds-finest-comics-part-1/).
Inside front cover. This PSA appeared in most DC issues dated May 1952.
On the page between page 6 and page 7 of the previous story sequence.
On the page between page 6 and page 7 of the previous story sequence.
Surprise Feature
On the page between page 2 and page 3 of the previous story sequence.
On the page between page 4 and page 5 of the previous story sequence.
Letters from Cliff Taylor, Rick Pitchy, Keith Brown, Charles Gumieney, Brian Church, Kevin Keegan, David Johnson, Arnold Secrest, George King, Norman Belair, and Unsigned.