TY  - BOOK
AU  -  Agor, R. 
TI  - Advanced surveying
U1  - 526.9 
PY  - 1981///
CY  - Delhi
PB  - Khanna
KW  - Astronomy
KW  - Feild astronomy
KW  - Hydrographic surveying
KW  - Photogrammetry
ER  -