Allen Appel: Sea of Time (1988), unpublished novel in the published Alex Balfour Pastmaster series
L. Frank Baum: Our Married Life (1912), Johnson (1912), The Mystery of Bonita (1914), and Molly Oodle (1915). Reported in Katherine Rogers's L. Frank Baum: Creator of Oz and Michael Patrick Hearn's The Annotated Wizard of Oz. According to Hearn, although not a published statement, The Mystery of Bonita is mentioned in contracts related to The Oz Film Manufacturing Company. The others are noted on file folders that once contained them and correspondence recovered from the Reilly & Lee offices, but the manuscripts themselves remain lost. The books were intended for adult readers, and correspondence for the first of these, Our Married Life, indicates that, unlike his four published adult novels, he did not want these books to appear under a pseudonym. Frank Joslyn Baum's biography of L. Frank, To Please a Child, claims that Maud Gage Baum burned Baum's unpublished manuscripts; however, it is known that much of this biography was falsified after Frank J. and Maud's falling out (including Frank J. being dropped from Maud's will) over the rights to the Oz books.
Amy Bishop: three novels, including The Martian Experiment (aka If Bullets Were Gold) and Amazon Fever[1][2]
Ray Bradbury: According to Sam Weller's authorized biography of Bradbury, four chapters were dropped from The Martian Chronicles before publication and remain unpublished: "They All Had Grandfathers", "The Disease", "The Fathers" and "The Wheel".
Frederik Pohl: For Some We Loved (1944), about New York advertising agencies; burned by author, who described it as "a long, complicated, and very bad novel"
Quentin Rowan: Curious Clover, a 2009 graphic novel about horse breeders
Artie Shaw: The Education of Albie Snow, a semi-autobiographical 1000-page, three-volume work
JP Miller: A Ship Without a Shore, memoir of Miller's WWII experiences aboard the aircraft carrier USS Cabot
Fulton Oursler: Autobiography in progress at the time of his death
Theodore Roosevelt: The Winning of the West: Roosevelt's series was originally meant to be more at least six books. However, due to the death of his first wife and the necessity to reflect because of it, Roosevelt edited the series to conclude at four volumes.
Yvette Vickers: Autobiography in progress at the time of her death
