The First Four Years is an autobiographical novel by Laura Ingalls Wilder, published in 1971 and commonly considered the last of nine books in the Little House series. The series had initially concluded at eight children's novels following Wilder to mature age and her marriage with Almanzo Wilder. Roger Lea MacBride found the work in the belongings of Wilder's daughter, Rose Wilder Lane, while going through her estate after her death in 1968. Wilder wrote all of her books in pencil on dime store tablets, and this one's manuscript was found in manuscript form as Wilder had written it.