The LC has a Preservation Division, which has posted some introductory information about the care and handling of books and other material. This page may be particularly helpful: Care, Handling, and Storage of Books.
We hope that this is helpful; If not, please feel free to submit your question to begin a conversation with a Reference Librarian.
This portal includes some of the most interesting and important items in the collection, including a copy of the Gutenberg Bible, Thomas Jefferson’s copy of The Federalist, medieval manuscripts, books relating to cookery, children's literature, and many more.