Young People's Science EncyclopediaeBook - 1970
Nearly four-thousand alphabetically arranged topics from many areas of the biological and physical sciences. Also includes more than two hundred suggested experiments and projects.
Publisher: Chicago, Children's Press 
Edition: Rev. ed
Characteristics: 20 v. (1896, 190 p.) illus. (part col.), col. maps, ports. 26 cm
Alternative Title: Science encyclopedia