You're quite welcome. I'm also a bit surprised you don't have The Scarlet Pimpernel on your list. I didn't think of it at first, since I was concentrating more narrowly on the 19th century and the first one didn't come out until 1903, but that works out with your long 19th century concept, doesn't it? It's an awful series (one could probably say the same of most of the books I just suggested), but I expect enjoyment in the reading is not your purpose here, strictly speaking.