CLEMENS, Samuel ("Mark Twain") (1835-1910). Autograph letter signed ("S. L. Clemens"), to Margery [H. Clinton]. New York, 2 December 1907. 1 page, 8vo, on personal stationery, light pencil annotation upper margin. Thanking the recipient for the birthday card, and inquiring about her safe passage home. "I am glad you got home safely. If I had piloted you all through as inefficiently as I began, I'm afraid you wouldn't have reached home at all."