Ultan, Lloyd The presidents of the United States / By Llioyd Ultan. - Danbury, CT : Grolier educational, 1996. - X, 127 p. : ports. ; 24 cm. - Roots of the republic 6 . Index: p. 107-127 ISBN: 0-7172-7608-2 (Set) 0-7172-7613-9 Subjects--Topical Terms: Presidents--United States--Biography