Plane and spherical trigonometry.
Lumabas, Rogelio S.
Plane and spherical trigonometry. - Quezon City : Phoenix Press, Inc, c1980. - ix, 394 p. : ill. ; 19 cm.
Plane and spherical trigonometry. - Quezon City : Phoenix Press, Inc, c1980. - ix, 394 p. : ill. ; 19 cm.