Very scarce First Edition 1888 copy of, "Der Sclavenhandel in Afrika und seine Greuel, beleuchtet nach den Vorträgen des Cardinals Lavignerie und Berichten von Missionaren und Forschern." by Walter Helmes. (German translation of title: The Slave Trade in Africa and its atrocities, enlightened by the lectures of the Cardinal Lavignerie and reports of missionaries and researchers). Writings of the Abolitionist movement at the end of the 19th century, based on the lectures of Cardinal Lavigerie, accounts of missionaries and explorers. 8vo. 8.6 x 5.8 inches. 60 pp., 2 leaves uncut. With frontispiece portrait of Cardinal Lavigerie. Original printed boards binding.