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James Blish: A Case of Conscience (1972, Arrow Books)

Lithia -- an alien world and a biologist's paradise. A four man team of scientists …

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A four-man team of scientists is investigating the planet Lithia, which is a biologist's paradise. One of the team is also a Jesuit priest, who suspects that it is a paradise in other respects as well, and this begins to trouble his conscience.