Kells, Lyman M.
Plane and spherical trigonometry - 3rd ed. - New York McGraw-Hill 1951 - xi, 290p. illus., diagrs 23 cm.
Spherical trigonometry
514 / KEL/1951
Plane and spherical trigonometry - 3rd ed. - New York McGraw-Hill 1951 - xi, 290p. illus., diagrs 23 cm.
Spherical trigonometry
514 / KEL/1951