Right of way plats for state and federal roads, filed on aperture cards by the State Highway Administration. The documents show the proposed routes of the roads and contain plat and contain plat and contract numbers assigned by the highway administration. The records are arranged numerically by state plat number. Plats prior to 1973 are found in (State Road Plat Book) in series C2211. Since October 1, 2002, the records are filed electronically with the Maryland State Archives as (State Road Plats) in series S1742. Access available in electronic form derived from the records themselves.