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\title{STANFORD EXPLORATION PROJECT}
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\author{Biondo~Biondi, Jon~Claerbout, Steve~Cole, Carlos~Cunha-Filho,
Gilles~Darche, Joe~Dellinger, Jean~Claude~Dulac, John~Etgen, William~Harlan,
Josef~Jedli\v{c}ka, Martin~Karrenbach, Clement~Kostov, Francis~Muir,
Dave~Nichols, Rick~Ottolini, Mihai~Popovici, Jos~van~Trier, and
Lin~Zhang}
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\hbox{\Large \bf Report Number 61, October 1989}
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