Especially since he can’t expect to make any money off it even if he gets a regular publisher, given the niche… There is zero reason for him (or his kids, I guess, to be more likely) to not just put it up on the Internet and provide an EPUB for people to read on their Kindles etc.
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That sounds like something James A. Michener would have written. So, roughly 1947 to 1995 or thereabouts?
Has your grandfather looked into self-publishing?
Especially since he can’t expect to make any money off it even if he gets a regular publisher, given the niche… There is zero reason for him (or his kids, I guess, to be more likely) to not just put it up on the Internet and provide an EPUB for people to read on their Kindles etc.