Inside front cover.
Promotional ad for The Flash #118, February 1961 and Green Lantern #4, January-February 1961.
Information for this sequence from Arthur Lortie.
Promotional ad for Superman Annual #2, on sale everywhere.
This PSA in the form of a quiz ran in several DC Comics cover dated February 1961 and again in October 1970.
Letters to the Science Editor with masthead illustration of Halley's Comet.
Credits for script, pencils and inks, and page count confirmed from Julius Schwartz's editorial records, provided by DC Comics. Fox, Infantino and Sachs confirmed in the letter column of Mystery in Space #75.
Submitted by J.S. Liebowitz, Business Manager on September 20, 1960. Average number of copies sold or distributed for each issue during the preceding 12 months was 248,000.
Inside back cover.