TY  - BOOK
AU  - A L ALLAN
TI  - PRACTICAL FIELD SURVEYING AND COMPUTATIONS
U1  - GN512.7834AL52P 
PY  - 1968///
CY  - LONDON
PB  - HEINEMANN
KW  - PRACTICAL FIELD SURVEYING AND COMPUTATIONS
N1  - MOERN BOOK HOUSE
ER  -