While I don't have too much stuff I have a few items I've run onto here and there (usually while looking for Dylan and Beatle things).
My favorite is a little movie theater booklet that has a picture of him on the cover. On the inside it advertises upcoming movies that will be in a particular theater. One of them is The Wild North plus some Robert Taylor movies.
Another is a comic book (why a comic book?) of Gun Glory. It has a photo of him from the movie on the cover and the rest of it is in comic form. Just recently I bought the comic of The Last Hunt also.
The fourth item I have is a promotional booklet put out by MGM about King Solomon's Mines. It is a twenty-six page booklet that tells about filming the show and has anecdotes and lots of pictures.
The fourth is the Life magazine from 1952 which has him on the cover.
I finally have his autobiography Sparks Fly Upward!! I found it through Amazon. I'd also like to find the book of King Solomon's Mines that was published the same time as the movie w/a picture of Granger/Kerr on it.