AU  - O'Neil,B.H.StJ.
TI  - Castles and cannon: a study of early artillery fortifications in England 
AV  - UG429.G7  O64 1960
PY  - 1960///
CY  - Oxford
PB  - Clarendon Press
KW  - Ordnance
KW  - History
KW  - Castles
KW  - England
KW  - Fortification
KW  - Great Britain
KW  - History, Military
N1  - Includes bibliographical references and index
ER  -