BIRKHOFF, GEORGE DAVID.
Basic geometry, by George David Birkhoff & Ralph Beatley. NM: p. 201-294.
BIRKHOFF, GEORGE DAVID. Basic geometry, by George David Birkhoff & Ralph Beatley. NM: p. 201-294. © 19Feb41; A152805. Scott, Foresman & Co. (PWH); 4Dec68; R450182.
Scott, Foresman & Co.|PWH