On-sale date from ad in The Brave and the Bold #60 and registration.
Dillin pencils and Haney script per Martin O'Hearn's blog:
http://martinohearn.blogspot.com/2016/01/dick-dillin-on-who-would-have-thought.html
Previous indexer credited Jim Mooney on pencils.
Letters from Charles Foote, Richard Stoyanowski, Bob Duncan, Richard O'Neill, S. Blackham, and Paul Dyroff.