The New Book of knowledge : Vol. 13 / Book of knowledge. AG5 .B64 1968 001 NEW First published in 1912 under title: The Book of Knowledge. A twenty volume edition illustrated with maps, pictograms, and photographs in color and black and white. Entries are written on a range of reading levels and are the work of qualified specialists. Every volume is separately indexed with cross references to pertinent information found in other volumes of the set. New York : Grolier , C1982. C1982. 1968 Text 20 v. eng