<Li> "The Return of Good Feeling," DeBow's Review, December 1867 . </Li> <Li> "Land Monopoly," Lippincott's Magazine, Vol. IV, September 1869 . </Li> <Ul> <Li> A Controversy on Slavery Between George Fitzhugh and A. Hogeboom, Printed at the "Oneida Sachem" Office, 1857 . </Li> <Li> Ante - bellum: Writings of George Fitzhugh and Hinton Rowan Helper on Slavery, Capricorn Books 1960 . </Li> </Ul> <Li> A Controversy on Slavery Between George Fitzhugh and A. Hogeboom, Printed at the "Oneida Sachem" Office, 1857 . </Li>

How did proslavery activists attack the free-labor system to justify the institution of slavery