TY - BOOK TI - The New book of knowledge: Vol. 13 SN - 0717205045 U1 - 001 PY - 1973/// CY - New York PB - Grolier, KW - Children's encyclopedias and dictionaries KW - Encyclopedias and dictionaries N1 - First published in 1912 under title: The Book of knowledge N2 - A twenty-volume edition illustrated with maps, pictograms, and photographs, mostly in color. Entries are written by qualified specialists at reading levels ranging from ages six to twelve. Every volume is separately indexed with cross references to pertinent information found in other volumes of the set ER -