Convention on the abolition of slavery the slavery trade and institution and practices similar to slavery - NA NA 1957 - Supplementary to the International convention signed at Geneva on September 15, 1926 Genva September 7, 1956 . Standard No.: 142,660 Source: Textual Subjects--Topical Terms: SOCIOLOGY Dewey Class. No.: Y1:492:5p1:N56, J7(906)