Here are a trio of covers that Kirby did published by Harvey over the years.
CHAMP COMICS #23, 1942. In the early 1940s, around the same time the DC work was launching, Kirby did a bunch of covers published on various Harvey books, signed “Jon Henri” when they were signed. No interiors, though. The CHAMP covers feature a pair of kids who I think are the “Liberty Lads”, going heavy on the war propaganda patriotism. Anyone know who did the stories for those characters?
FIRST LOVE ILLUSTRATED #69, 1956. This is a nice goofy romance cover, probably the only comic to have a pirate, rabbit, knight and cowgirl.
WARFRONT #30, 1957. Very intense war cover, with an interesting inking style.