Wonderworld Comics #28, #31
Blue Beetle #48, #49, #50
Harvey Comics: All-New Comics #8, #15
Holyoke: Cyclone Comics #4; Captain Aero #18, 19, 20
this one's not public domain, so can't be shared here, but i'm also hoping to see this show up sometime soon:
War Victory Comics #1 (Harvey, 1942) [Green Hornet]