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An opportunity has arisen to investigate deep Pre-cambrian structure in northern Illinois. A 1500-m hole, 7.5 cm in diameter, is being drilled near the town of Winslow, in Stephenson County. Researchers interested in geological and geophysical studies on this hole should contact Bezalel Haimson, at the University of Wisconsin-Madison, by March 17. He can be reached at 608/262-2563, 262-3732, or 262-1478, or at 1509 University Avenue, University of Wisconsin, Madison, Wisconsin 53706.