00372nam a2200145Ia 4500 230917s9999||||xx |||||||||||||| ||und|| 66243 MAIN English 551.22 H367H Helbig, Klaus Foundations of anisotropy for exploration scismics Oxford Pergamon 1994 xvi, 486 p. BK 0 0 0 551_220000000000000_H367H 0 120773 MAIN MAIN 2003-01-17 0 551.22 H367H 154757 2023-09-17 20:58:06 2023-09-17 BK 78659 78659