Oxford junior encyclopaedia : Vol. 1. Mankind / general editors, Laura E. Salt & Geoffrey Boumphrey ; illus. editor, Helen Mary Petter. Salt, Laura E., ed. Boumphrey, Geoffrey Maxwell, 1894- ed. Encyclopedias and dictionaries. AG5 .O87 030 OXF London : Oxford University Press, 1957. 1957. 1957 Text v. : eng