This collection consists primarily of letters between Oka and Sarah Ann while he was in Lansing, Michigan. Sarah Ann's letters deal mainly with family matters and the farm. In his letters, Oka describes Lansing and the politics of the Constitutional Convention and the legislature.

Their son, Carlton, married Nellie Faling and the couple settled in Clam Lake, Michigan (now Cadillac), where they ran a store. A series of letters from Nellie to her family in 1875-1876 describes their life there and discusses family news.

Also included in the collection is a letter book kept by Nellie's brother, Charles Faling. A student at West Point, Charles copied letters he received into the book. The book was later used to record accounts, some personal and some for an unidentified business. The collections contains a tintype photograph of Charles Faling.