TY  - BOOK
AU  - Birch ,Thomas William
TI  - Maps , topographical  and statistical/ 
U1  - 91:524  BIR 
PY  - 1949///
CY  - Oxford  : 
PB  - Clarendon press  , 
KW  - Cartography
N1  -  Sources of information  :p.{235}  -238
ER  -