http://pec.lib.wvu.edu/record/P11781941A Birational Tn+2 associated with a Q1,n congruence.Journal article reprint from: <em>Proceedings of the West Virginia Academy of Science,</em> v.15 (1941). Also issued as: <em>West Virginia University Bulletin</em>, 43:no.8/11 (1942:Feb.). Vest, M. L.Transformations (Mathematics)Congruences (Geometry)14256