Sommerville, Duncan McLaren Young, 1879- **E 5 129.204 The elements of non-Euclidean geometry. — Chicago. The Open Court Publishing Co, 1919. xvi, 274 pp. Diagrams. 18cm., in 8s.
 
 
 
 
ye This card was print.d at the Boston _
Mo03 — Geometry. Non-Euclidean. ©
Public Library, Ja::uary 31, 1921.