On-sale date from copyright registration.
Credits for pencils confirmed from Julius Schwartz's editorial records, provided by DC Comics. Schwartz kept editorial records for Robert Kanigher who edited this issue.
Credits for cover scripts and letters from Carl Gafford via the GCD Error Tracker.
1st mention of "responsometers." Letters credit from Carl Gafford via the GCD Error Tracker. Story in 4 parts: unnumbered part I (5.67 pp.), Part II (5.67 pp., titled "The Metal Men vs the Rain of the Missile Men!"), Part III (6 pp., titled same as Part II), Part IV (7 pp., titled same as Part II)
Credits per Nick Caputo, February 2018. On the page immediately following page 12 of the main story sequence.
Letters from Mrs. Gilbert Bogs, Ray Gardner, Richard West, Terry McBain, Bill Heskins.
On the page immediately following page 18 of the main story sequence.