This was really difficult because I think of the Fourth World books as one work, not three or four (Jimmy Olsen was part of the saga for only part of Kirby's run). I ended up voting for New Gods because of the issue "The Pact", and because no one else had.

And some people really liked "The Losers", the war stories Jack did in the pages of Our Fighting Forces at the same time as he was doing Kamandi and OMAC.

D'oh, forgot the Losers in the post-Marvel Kirby oeuvre IA m piecing together int he other thread. Have to add it in. Thanks for the reminder Rob Allen.

-M

Well, Kirby served in WW II and had first hand knowledge and experience.

Yes, many regard it as some of Kirby's best work.

Like Cei-U I thought of Streetwise, and love it insanely.

Another lesser known work he did was the In the Days of the Mob one-shot he did (that was recently reprinted).  That was notable, and worth getting too IMO.

Hondo is spot-on as usual. For those may not know, Kirby served as a "scout" for his WW II outfit and witnessed many of the war's horrors up close. In JK's own words: 

"I remember that I walked into this town where they had the Command Center. This Lieutenant called me over and said, "Private Kirby?" I said, "Yes, sir." He said, "Jack Kirby? The artist?" I said, "Yes sir. I drew Captain America..."

"And Boy Commandos," he said. Lots of guys knew who I was, so this did not surprise me—you have to remember that the Simon/Kirby name was very popular at the time and many adults were reading comic books back then. "So you can draw?" he said. "Yes sir," I said, "Of course I can draw." I was thinking, "Great, some officer wants me to draw his portrait." Then he said, "Good. I am making you a Scout. You go into these towns that we don't have and see if there is anybody there. Draw maps and pictures of what you see and come back and tell us if you find anything."

Well, I can tell you that was one time I was not happy to be known as an artist—but, I did my duty of course; I did what the Lieutenant told me to do. I went into these towns and it was like they show it in the movies, nobody was around and the place was a mess; buildings burned out, shattered rubble everywhere. I saw lampposts twisted into shapes, bent like pretzels..."


There's more here: 
twomorrows.com/kirby/articles/27ww2.html

Kirby also did another black & white magazine for DC called Spirit World.



As you'd guess, it too is pretty good.



In fact I remember get chills up my spine looking at it as a kid.





He effectively works with photo collage

I haven't read half of the books on this list sadly even though Kamandi and OMAC have always been on my to-read list.

Of those I have read, I voted for New Gods just because of it's epic scale and mythos-building.

I'm surprised at the reviews for 2001 though. I never knew Kirby worked on that title nor of the quality of types of stories for it. Sounds really interesting.

Never heard of this one, and now I clearly need to own it. Thanks much for posting this!