Interior contents need to be recorded. Known to be from Detective Comics (1937 series) #37.
Gaines and Mayer were the Managing Editor and Assistant Editor, respectively, of the All-American titles at this time. All-Star #1 was eventually published by All-American. Vincent Sullivan was the credited Editor on Detective Comics #37, his last credit on the title before leaving for Columbia.
from Flash Comics (DC, 1940 series) #1 (January 1940) [in black and white]