New York (State) Department of Environmental Conservation. (1973). Environmental plan for New York State (Preliminary ed.). s.n.
Dyfyniad Arddull ChicagoNew York (State) Department of Environmental Conservation. Environmental Plan for New York State. Preliminary ed. [Albany: s.n, 1973.
Dyfyniad MLANew York (State) Department of Environmental Conservation. Environmental Plan for New York State. Preliminary ed. s.n, 1973.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.