Toy, Sidney. <br/><br/>
A history of fortification from 3000 B. C. to A. D. 1700 / 
Sidney Toy. 
 - 2nd ed. 
 - Londond :  Heinemann,  1966. 
 - xxiv, 280 p. :  ill.;  23 cm. 
<br/><br/> Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Castles. <br/>Fortification.   
<br/><br/><label>Dewey Class. No.: </label>728.81  / TOH 1966