Lastly, with his book, "The Library of Great American Writing," Louis Untermeyer talks about Mark Twain, Emily Dickinson and personal friends of his, Robert Frost and Carl Sandburg. Twain, said Untermeyer, started out as a humorist but then became more pessimistic with "The Adventures of Huckleberry Finn". Emily Dickenson wrote in secret and she only gave permission for six of her poems to be published.