TY  - BOOK
ED  - National Coal Board (Gran Bretaña) NCB 
TI  - Surveying practice
PY  - 1973///
CY  - London
PB  - National Coal Board, Mining Department
KW  - Topografía
KW  - Texto
N1  - Cab. Port. NCB (Mining) codes and rules; Incluye 28 figuras
ER  -