That Other Hemingway provides a referenced handbook to accompany Hemingway's online Library (11981) as it demonstrates Hemingway's dependence on his massive library as a basis for what he called invention, in the manner of Henry James, Cezanne, and Tolstoy. The insights of his personal Doctor (Herrera) and his long-standing correspondence with Malcolm Cowley and Bernard Berenson reveal his desperate loneliness in Cuba and allow him an opportunity to analyze and promote his own theory of fiction. All three sources are not available to critics or the general public, this discussion provides profound insight into the last twenty years of his previously ignored life in Cuba.