Once again I am privileged to attend a Midcontinent Regional Meeting of the Society of Exploration Geophysicists—this time with the honor and responsibility of addressing you on a subject receiving increasingly serious consideration among scientific and engineering groups. As in the past I am highly impressed with the outstanding quality of the program and arrangements for this meeting. On behalf of the other officers of the national Society, who are all attending this meeting, I welcome this opportunity to congratulate the officers and committeemen of the sponsoring and participating societies for the successful culmination of their efforts and to commend the authors for their cooperation in contributing to this outstanding program.

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