Then use tax, land, marriage, court, cemetery, and church records. Wills are very good also. Civil, court, and vital records. Land ownership records. Church and parish records.
Wills are a good source where they exist.
There is a good chance that one or more branches of your family tree may pass through the microfilm on the shelf. I'll use the St. George, Utah Family History Center as an example of the types of microfilm you may expect to find. A number of English parish printouts on fiche. Some family histories and biographies of early people and families. Many misc. records.