00350nam a2200133 a 450000500170000000800410001704100080005808200120006610000130007824500520009125000120014326400280015530000330018320260717091715.0260717s1997    ii            000 0 eng d  aeng04a627.1311 aAgor, R.12aA textbook of surveying & levelling /cAgor, R.  a8th ed. 1aDelhi :bKhanna,c1997.  axxii, 968 p. ; ill. ; 21 cm.