Pippenger, Wesley, District of Columbia Marriage Licenses, Book 1, 1811-1858. P. 181 Duvall, William T. Bowen, Elizabeth T. June 25, 1833 There are many Duvalls in this volume. There are four Henry Scotts listed; the earliest is 1818. For a marriage about 1811, you should check the Maryland archives. Charlotte Mattern