. . . . . . . . . . . "Although much of her work has centered on Mark Twain, she has also published on writers including Gloria Anzaldua, John Dos Passos, Frederick Douglass, Theodore Dreiser, W.E.B. Du Bois, Paul Laurence Dunbar, Charlotte Perkins Gilman, Erica Jong, Maxine Hong Kingston, Theresa Malkiel, Tillie Olsen, and Walt Whitman." . . .