1. Multivariate analysis of petrographic and chemical properties influencing porosity and permeability in selected carbonate aquifers in central Pennsylvania;Brown,1977
2. Geology and mineral resources of the Bellefonte quadrangle, Pennsylvania;Butts;US Geol. Surv. Bull.,1936
3. On correlation in petrography;Chayes;J. Geol.,1949
4. On correlation between variables of constant sum;Chayes;J. Geophys. Res.,1960
5. Business Statistics;Daniel,1983