Look for the archival label on storage products - "acid free" or 'archival safe".
Many legal instruments other than deeds appear in deed books. They include Bills of Sale, Prenuptial Agreements, Powers of Attorney, Contracts, Affidavits, Wills and Inventories and Voter and Jury Lists.
Think out of the box for surname spelling variations. Surname spelling standardization didn't begin until the early 1900s. Many people were unable to read or write or spell!