On-sale date from ad in Superman's Pal, Jimmy Olsen #81.
Letters page contains letter from Frank Brunner.
Continues the trend of no Robin on the cover.
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. Also appears in December 1960 issues.
Chapter 1 of 2. Continued in next sequence. Chapter info by Bob Bailey, 2005-01-20 (Per Sandell ed.)
Between parts 1 and 2 of first story.