1. Geology and Mineral Resources of the Bellefonte Quadrangle, Pennsylvania;Butts;U. S. Geol. Survey Bull. 855,1936
2. Ordovician Carbonate Rocks near Bellefonte, Pennsylvania;Swartz,1958
3. The Geology of the Gatesburg Formation in the Bellefonte Quadrangle, Pennsylvania, and its Relationship to General Occurrence and Movement of Ground Water;Landon,1963
4. The Hydrogeology of the Sewage Disposal Experiment Area, Northwest of State College, Pennsylvania;Caruccio,1963
5. Ground water Resources of Dupage County, Illinois;Zeizel,1962