house ad for Secret Six (DC, 1968 series) #2 and The Brave and the Bold (DC, 1955 series) #78
Story across 23 pages, but page 8 is a 2/3-page and pages 16 and 23 are 1/2-pages.
house ad for Superman (DC, 1939 series) #207 [80 Page Giant #G-48], on sale April 9
Listing of DC comics on sale in late April, 1968; page includes cover art from Adventure Comics (DC, 1938 series) #369 and Detective Comics (DC, 1927 series) #376.
hint submitted by Joe Gregory of Greensboro, North Carolina