Forder, H. G. 1889- The calculus of extension, by Henry George Forder; including examples by Robert William Genese. - New York: Chelsea, 1960. - 490 p.: illus., 21 cm. LCCN: 59011778 Subjects--Topical Terms: Ausdehnungslehre. Dewey Class. No.: 516 / F711c