O'Neil, B. H. St. J. <br/><br/>
Castles and cannon :  a study of early artillery fortifications in England / 
by B. H. St. J. O’Neil. 
 - Oxford :  Clarendon Press,  1960. 
 - xix, 121 p., 24 p. plates :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ordnance --History.<br/>Castles --History--England.<br/>Fortification --History--England.
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Great Britain --History, Military.
<br/><br/><label>LC Class. No.: </label>UG429.G7   / O64 1960