The elements of non-Euclidean geometry.
Sommerville, Duncan M'Laren Young, 1879-1934.
The elements of non-Euclidean geometry. - New York: Dover, [1958]. - 274 p.: illus., 18 cm.
Geometry, Non-Euclidean.
516.1 / S697e
The elements of non-Euclidean geometry. - New York: Dover, [1958]. - 274 p.: illus., 18 cm.
Geometry, Non-Euclidean.
516.1 / S697e