1. The incomplete dissociation of some thallous and calcium salts at different temperatures;Bell;Trans. Farad. Soc.,1953
2. Geology and mineral resources of the Bellefonte Quadrangle, Pennsylvania;Butts;U.S. Geol. Surv. Bull.,1936
3. The Hydrogeology of the Sewage Disposal Experiment Area Northwest of State College, Pennsylvania;Caruccio,1963
4. Geology of the Ordovician Carbonate Formations in the State College. Pennsylvania Area and Their Relationships to the General Occurrence and Movement of Ground Water;Clark,1965
5. The ionization constant of HCO3 from 0 to 50°C;Harned;J. Am. Chem. Soc.,1941