TY  - BOOK
AU  - Duggal, S.K 
TI  - Surveying vol 1 
SN  - 9781259028991
U1  - 624.18 DUG  
PY  - 2015///
CY  - Mcgraw hill book company 
PB  - New Delhi 
KW  - SURVEYING
ER  -