Elting, Mary <br/><br/>
The Answer Book /   Complete Answers to 3000 questions children ask most often / 
Mary Elting ;  Ill. by Tran Mawicke, and others. 
 - New York :  Grosset & Dunlap ;  1963. 
 - 158 p.:  ill.;  28 cm. 
<br/><br/> Index, p. 154-158 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Reference books --Technology