I would throw The Human Past, Mathematics from the Birth of Numbers, and US Army Survival guide into the mix. I also think there should be more of a focus on c

I would throw The Human Past, Mathematics from the Birth of Numbers, and US Army Survival guide into the mix. I also think there should be more of a focus on construction/architecture and agriculture/horticulture. A book containing some facts about earth science and especially on the unique geographic features of each region of the world would be necessary. I would also add a book on common plants and their uses and a book on human health/nutrition. I think people are focusing too much on the luxuries of complex civilization. If you're at the point where you have to rebuild civilization it would be more necessary to focus on building a good foundation i.e focusing on improving your food, water, shelter, medicine, and social systems. I think the book Mathematics from the Birth of Numbers would be a good enough foundation to get started on physics, mechanics, and math.