Otto, Emil. German conversation-grammar, - 34th ed. - New York, Heidelberg, J. Groos; Brentano's; [etc., etc.] 1939. - viii p., 2 l., 405, [1] p. 20 cm. LCCN: 44024575 Subjects--Topical Terms: German language--Grammar--1870 LC Class. No.: PF3111