TY  - BOOK
AU  - Duggal S K
AU  - Duggal S K
TI  - Surveying vol-2
SN  - 9780070151352
U1  - 526.9 DUG-S 
PY  - 2011///
PB  - T M Hill
KW  - Mathematical geography
N1  - 1. Trigonometric Levelling 2. Triangulation 3. Theory of Errors and Triangulation Adjustment 4. Hydrography 5. Aerial Survey 6. Remote Sensing 7. Digital Image Processing and Analysis 8. Geographic Information System (GIS) 9. Global Positioning System (GPS) 10. Field Astronomy
UR  - https://books.google.co.in/books?id=3oFSAgAAQBAJ&printsec=frontcover&dq=surveying+volume+2&hl=en&sa=X&ved=0ahUKEwi9hoLEht7iAhVHXn0KHYsNCmgQ6AEILjAB#v=onepage&q=surveying%20volume%202&f=false
ER  -