Another name to research -- Carl Barks.
He did a lot of classic stories of the Ducks -- Donald, Uncle Scrooge, Huey, Dewey, and Louie -- back in the 1950s. It sounds like you might have some from that era.
Another good source I just thought of is www.milehighcomics.com. Mile High Comics is a big comics store in Denver. You might be able to look at their online store and see how much what you have is selling for on there.
How successful was he at keeping them in mint condition? Also, have they been bagged? If not, I'd recommend getting some comic bags to store them in.