Pennsylvania may be very nicely-forested, and about sixty p.c on the State remains woodland. On the best spots the trees are mostly white pine, yellow pine and hemlock, but decreased concentrations are covered with deciduous forests of black, white and pink oak, chestnut, tulip tree, ashes, hickories and black walnut. https://www.tjcyindustrialchem.com/news/what-is-sodium-tripolyphosphate-stpp-used-for.html