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Lesikar, Raymond V, 326.23-L629b | Irwin | 1993 326.23-L629b,
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Lesikar, Raymond V, 802-L629r | Irwin | 1995 802-L629r,
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Pettit, Michael, 840.9-P511w | University of Iowa Press | 1996 840.9-P511w,