Series I: Correspondence of Sarah Probert Watkins, 1857-1915 houses letters written between Watkins and various (primarily female) family members. These women discuss their daily activities and communicate family and local news. Among the most frequent correspondents are Eliza (Probert) Freeman and Emma Frances Watkins.

Series II: Correspondence of George Probert, 1866-1899 and Series III: Correspondence of Other Family Members, 1864-1948 house letters written between other members of the Probert family. The majority of George Probert's correspondence discusses business and personal matters and dates from between 1866 and 1899.

Series IV: Other Family Papers, 1838-1879 houses letters to John Watkins (including a notice of an 1873 reunion of the 19th Ohio Battery) and items documenting Tinnie Watkins' training and certification as a school teacher.