Potomac Valley Conservancy District. Permitting certain States and District of Columbia to enter into compact respecting creation of Potomac Conservancy District, report to accompany S. J. Res. 162 [to permit Maryland, Virginia, West Virginia, Pennsylvania, and District of Columbia to enter into compact or agreement respecting creation of Potomac Valley Conservancy District for prevention or abatement of harmful pollution of waters thereof]; submitted by Mr. Mansfield.