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K. L. Thomas, C. S. Romanek, S. J. Clemett,E. K. Gibson, D. S. McKay, C. R. Maechling, and R. N. Zare, “Preliminary Analysis of Polycyclic Aromatic Hydrocarbons in the Martian (SNC) Meteorite ALH84001,”Lunar Planet. Sci. Conf. XXVI, 1409 (1995).