Bonjour, we authors and inventors work VERY hard to create a new work. I have experience in this area since 1970s.
1/ US copyright law is clear and simple, you do not need a lawyer to understand, just do the search.
2/ Many old works are now allows in open source project.
3/ Best Physics book I know was my Univ 1965 Sears and Zemanski. Many old copies are discards by libraries, at rummage sales, epay etc.
4/ Scanning a text book is not easy and VERY hard tro get a high qual PDF without a special scanner or destruction of the binding.
5/ The author's estate OR the book published can initiate legal action against you.
PLEASE DO NOT DO IT. BUY THE BOOK.
Kind Regards,
Jon