1971 Senate Bill 1529. An Act Providing That A Certain License Granted By The Department Of Public Works To Build And Maintain A Sea Wall And To Fill Solid In The Charles River, In So Far As Said License Pertains To Certain Land, Shall Be Irrevocable, And Authorizing The City Of Boston To Acquire Said Land And Convey It To The United States In Exchange For Certain Land Of The United States.