00246nam a22000977a 4500003000400000008004100004082001600045100002000061245002600081260004100107OSt230616b        |||||||| |||| 00| 0 eng d  a581bEqs402  aKanet Kar, T.P.  aSurveying & Levelling  aBishan SinghbA.V. Griha Prak.c1968