000 00367nam a2200145Ia 4500
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040 _e118991
_aMAIN
041 _aEnglish
082 _a551.22 H367F
100 _aHelbig, Klaus
245 0 _aFoundations of anisotroph for exploration seismics
260 _aU.K
_bPergamon
_c1994
300 _a486p. p.
942 _cBK
999 _c94816
_d94816