Clark was the author of The Indian Sign Language, 1885 (published posthumously), to this day the definitive and comprehensive primary source on the rich sign language of The Great Plains tribes.
William Shakespeare | William Laud | William Blake | William | William III of England | William Morris | William McKinley | William Howard Taft | William Ewart Gladstone | William the Conqueror | William S. Burroughs | Clark Gable | William Shatner | William Faulkner | William Randolph Hearst | William Wordsworth | William Tecumseh Sherman | William Hogarth | Prince William, Duke of Cambridge | William Penn | William Jennings Bryan | William Gibson | William Wilberforce | Clark | William James | Petula Clark | William Makepeace Thackeray | Fort William | William Hanna | William Hague |