1. Arur, M.G. and Baveja, S.D., 1984, Status of the establishment of vertical datum and the level-net in India, unpubl. manus., Survey of India, Dehradun.
2. Bomford, G., 1971, ‘Geodesy,’
3rd ed., Oxford Univ. Press, London.
3. Bossler, J.D. and 23 others, 1982, AAGS Memo 2, ACSM, Falls Church, Va.
4. National Geodetic Information Center;D Cartwright,1985
5. National Geodetic Information Center;Colombo,1985