Inheriting Novels and Memoirs

I’d like to know what the procedure(s) are/is for submitting the intellectual property of some one who has passed on.
My father left behind, diaries from his whole life, including his war years during WWII. They’re fascinating. And on top of that, he’s left behind three complete novels and well over 100 short stories. Some of them are fairly good, but need editing. I’d be happy to do that.
What I’m really interested in having published are the WWII diaries, they’re stellar, and with the populace of veterans dying, I think it’s a shame to let testimonials land in netherspace.
Any advice on how to proceed with this? Thank you.

Miss Snark, the literary agent, replies.

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