The U.S. National Archives holds a copy of "Ellicott's engraved Plan superimposed on the Plan of L'Enfant showing the changes made in the engraved Plan under the direction of President Washington". See "Scope & Contents" page of "Archival Description" for National Archives holding of "Miscellaneous Oversize Prints, Drawings and Posters of Projects Associated with the Commission of Fine Arts, compiled 1893 - 1950", ARC Identifier 518229/Local Identifier 66-M; Series from Record Group 66: Records of the Commission of Fine Arts, 1893 - 1981. Record of holding obtained through search in Archival Descriptions Search of ARC - Archival Research Catalog using search term L'Enfant Plan Ellicott, August 22, 2008.
boundarystones.org
The north-south axis is a straight line connecting the north and south cornerstones of the original District of Columbia. The east-west axis is a straight line connecting the east and west cornerstones of the original District of Columbia. The map of the boundary stones in Boundary Stones of the District of Columbiainwebsite of boundary stones.org (Accessed August 18, 2008) identifies the location of each cornerstone.
