TY  - GEN
AU  - Duggal, S.K.
TI  - Surveying Vol. 1
SN  - 0074620894
U1  - 526.9 
PY  - 1996///
CY  - New Delhi
PB  - Tata McGraw-Hill 
KW  - Surveying
KW  - Astronomy and allied sciences
KW  - Mathematical geography
ER  -