What did Heinlein have to do with Lucifer's Hammer? Pournelle wrote that with Larry Niven.
My favorites were the Janisaries series that he wrote....still love those books!
Lol, but I’d have to agree that would rank near the top of my list - it’s the first time I realized that books (and by extension, knowledge, skills, and information) would be the most valuable commodity in a SHTF scenario, not the number of bullets or beans you’ve stockpiled. Those things will eventually run out and you’ll still have to deal with the baddies, whereas they will line up to defend and protect the man who knows how to make fuel or a radio transmitter.
My top books would be Heinlein, absolutely. The only question would be which.