To mark Black History Month, Penguin Classics is reprinting six early 20th century books by African-American writers. The five Harlem Renaissance novels, along with W.E.B Du Bois' 1903 masterwork, The Souls of Black Folk, are much more than a summons to reader-ly duty. Rather, they're a shake up and wake up call, reminding readers of the vigorous voices of earlier African-American writers, each of whom had their own ingenious take on "the race problem" and identity politics.