TY  - BOOK
AU  - Purton Peter Au.
TI  - Medieval military engineer:  from the roman empire to the sixteenth century
SN  - 978 1 78327 278 5 (hbk)
U1  - MV41.5, Q8 
PY  - 2018///
CY  - New York
PB  - The Boybell Press USA   
KW  - EUROPE - HISTORY; MILITARY ART AND SCIENCE
ER  -