How could I locate an old comic?

I am not a comic collector but I am interested in locating any old comics that include artwork/writing by Stan Randall. Stan was my grandfather and I currently don't own any of his work. I have looked online and haven't found much except articles, etc about him. I am interested in any of his work, but I'm particularly excited to see the DC "new comics" from the 1930's. Any advice on how to go about finding such things would be appreciated :-)