TY  - GEN
AU  - Duggal , S.K.
TI  - Surveying
SN  - 0074620908
U1  - 526.9 
PY  - 1996///
CY  - New Delhi
PB  - Tata Mcgraw -Hill 
KW  - SURVEYING
KW  - TRIGNOMETRICAL LEVELLING
KW  - GEODETIC SURVEYING
KW  - TRIANGULATION
KW  - ELECTRONIC DISTANCE
ER  -