I will go treasure hunting in the basement next time I am over at my parents place. At one point my dad had over a thousand books and a thousand records but he has sold some, donated some of the books over the years. Still a healthy collection. 

grayruby

BooksAndArticles

"Nightfall," by Isaac Asimov

StillStackinAfterAllTheseYears

There's both the original short story (which I'm sure your dad has in a collection) and also an expanded novel that Robert Silverberg (another great of the era) co-wrote with Asimov twenty years later. I like them both, but if you've got a preference for one format over the other, that might be something to consider.