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Comets and Extinctions; Cause and Effect?
; Jansa, L F; Aubry, M P; Gradstein, F M; in, Global Catastrophes in Earth
History; An Interdisciplinary Conference On Impacts, Volcanism, and Mass Mortality
; Sharpton, V L (ed.); Ward, P D (ed.).
Geological Society of America, Special Paper no. 247, 1990 p. 223-232 (GSC Cont.# 12889)