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That should be already in your knowledge "package", information is easy to carry... tools/weapons don't.
You never go to a trip alone, like in a survival mode? Life out there is really dangerous. Just a book will not protect you.
yes, def not carrying books, those knowledge should be within you.
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An axe would be a great choice and would be on my list if it were possible to add more items. It's true that knowledge could already be part of the luggage, but in all honesty, my knowledge in this area is limited. I choose the book from a long-term perspective and for the purpose of knowledge transfer. Each person will choose a different object because we are all different and have different levels of knowledge in various areas.
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True it reminds me of that amazing survival story (book and film) .. wild something I think
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true but just think about this aspect: planting and growing stuff, takes time and you can learn it yourself, just by observing nature, testing etc.
The cavemen didn't jumped from caves into agriculture without having first the axe made from stones...
Until a plant will grow and be ready to eat, you need: shelter, fire, food. You said "There are no houses, cars, tools, nothing." that means not even plants ready to eat. Planting needs fertile soil so you need to find one first. maybe you are at kms away from it.
Taking a book with you... you will die after 10 days and you still didn't grow any plant. Good luck with that.