TThe Allegheny ReservoirThe Allegheny Reservoirde Simonds and Simonds, Warren County Planning Commission (Pa.)Ediciones (1)The Allegheny Reservoir (1963)inglésMás obras de Simonds and SimondsTToward a better environmentToward a better environmentAAllegheny CommonsAllegheny CommonsAA study of Twelve Mile IslandA study of Twelve Mile Island