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035 _a(Sirsi) u35046
041 _aeng
050 _a526.9028
100 _aGrist, M.W.
245 _aDigital terrain models; paper no. C2
350 _a0
520 _aIn: RICS. Land surveyors conference, March, 1968. 1968/52A
942 _n0
948 _c04/03/1997
999 _c90029
_d90029