First published April 7, 2017   In the 1947 centennial edition of The Diary of a Forty-Niner published by James Ladd Delkin, Oscar Lewis, a California historian, researched the origins of the book. Below is his introduction along with his findings. ——— In the voluminous literature of the Gold Rush The Diary of a Forty-Niner has long occupied a position at once unique and puzzling. …