Langer, William Leonard An encyclopedia of world history ancient, medieval, and modern, chronologically arranged compiled and edited by William L. Langer. - 4th ed., rev. and enl. - Boston Houghton Mifflin 1968. - xxxix, 1504 p. geneal. tables, maps. 25 cm. LCCN: 68014147 Subjects--Topical Terms: History--Outlines, syllabi, etc. LC Class. No.: D21 / .L27 1968 Dewey Class. No.: 902.02