SOME NOTES ON XI BOOTIS [cover title]. [Chicago: Advent: Publishers, 1960.]. Octavo, pp. 1-12, pictorial wrappers. First edition. Signed by Clement. Extrapolation of astronomy, geology and biology of an imaginary solar system summarized -- with diagrams -- for a lecture, "Interstellar Stage-Setting," delivered at the 18th World Science Fiction Convention, 2 September 1960. A fine copy. (#110050).
No statement of printing.