My children are putting together a scrapbook of theatre programs and photos. Always use acid-free supplies. Different weights of paper can be obtained from art-supply stores. Archival mounting corners can be purchased from conservation suppliers. I have an old deed.
Most framers are knowledgeable in conservation framing.
Ask your framer if he or she has had training in this technique. Be sure that all framing materials are acid-free. Be sure that no glass or plastic touches the item. I have some old family letters. Old family letters can be framed as above.