INTERNATIONAL SEISMIC CREW COUNT

-------------Quarter ended-------- - March 1992 - December 1991 Land Marine Land Marine U.S.................... 67 13 66 19 Canada................. 32 0 32 0 Mexico................. 23 2 23 0 Cent. & S. America..... 44 6 50 3 Europe................. 26 43 32 36 Middle East............ 32 1 41 2 Africa................. 41 8 35 12 Far

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