Lot of eight vintage civil engineering, books from American School Chicago

This is a lot of eight civil engineering and mathematical books with rust card stock textured covers. They are in very good condition for their ages. All books have their covers attached. There is fading and where on the spines have some watermarks or other perhaps oil mark on the front. The inside are all complete from what I can see all pages are firmly intact and none are missing. They appear to be very clean. I do not see much writing in them ,some have some pieces of notebook paper that the owner had left their notes inside, which are very interesting.. The first civil engineering book is 1933. The trigonometry is 1934 algebra two is 1934 algebra IV is 1933. plain surveying is 1930 part three is 1928 strength of materials 1934 practical physics 1932. Non-smoking home. I’m happy to answer any questions.