I found the following listings in Dorothy Provine"s "District of Columbia Marriage Records 1870-1877". I furnished the first since you stated that Mary E. Marks marriage to ? Mann might have been a second marriage. The numbers following the names show the the volume and page of the Record of Marriages which are now located at the DC Archives. The L after the date of marriage indicates that only the license portion of the form was filled in, the marriage return filled in by the minister was not complete. Mann, Charles Addision Lee, Mary Elizabeth 30 June 1874 L 7:22 Todd, Edward Marks, S. Kate 3 June 1875 8:100