Yorke was the author of the best-selling textbook "The Ghosts of Bigotry", originally republished in San Francisco 1913 from new plates, the originals having been destroyed in the earthquake and fire of 1906. It was the genesis work of the Catholic Truth Society, in response to an anti-Catholic literary campaign by the American Protestant Association, and a frank account of the "Black Myths" of English Protestant opposition to the Roman Catholic Church from the reign of Elizabeth I through to Catholic Emancipation and the Ecclesiastical Titles Act 1851 in the 19th century. Its concluding chapter sets the scene of Catholic resurgence in the USA. The publisher was the Text Book Publishing Company, 641 Stevenson Street.