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McMillan, N.; Harmon, Russell S.; Wörner, G.; Davidson, Jon P.; Turner, D. L.; Moorbath, S.; Lopez-Escobar, L.; Nyes, C.; Moreno, H. (Springer-Verlag, 1988-09)
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Harmon, Russell S.; Curl, Rane L. (National Speleological Society, 1978)