Fonds consists of personal correspondence, newspaper clippings and manuscripts; as well as, memorial tributes, cards and letters of sympathy pertaining to the passing of Sonthoff. The fonds is arranged in the following series: Correspondence, Essays and Criticisms and Memorial Tributes.

The fonds consist of incoming letters from Jane Rule to Carolyn Gossage (1969-2002). It also includes a couple of incoming letters from Mary Meigs and Helen Sonthoff and miscellaneous published review articles of Rule's work.