Inside front cover.
Story continues in Whiz Comics (Fawcett, 1940 series) #25.
The last 1/3 of page 15 is an illustrated advertisement for the latest issue of Bulletman, with figures of Bulletman and Bulletgirl shown.
Carlson can be recognized by his horses with rather long, narrow tapering heads, and especially by his way of drawing the legs of running horses. In panel 8 on page 2, notice the outstretched front leg of the white horse.