Fiction

Edwin A. Abbott, Flatland: A romance of many dimensions, 1884.
George Eliot (Mary Ann Evans), Felix Holt, The Radical, 1866.
Rudyard Kipling, Captains Courageous, Stalky and Co., The Jungle Book, Just So Stories and more (20 books so far).
Lucy Maud Montgomery, including six of the eight Anne Shirley books, two Chronicles of Avonlea books, and three others for a total of eleven books.
Robert Louis Stevenson, The Strange Case of Dr. Jekyll and Mr. Hyde, 1886.
H. G. Wells, The War of the Worlds, 1898.