Comments on the mean density of Pluto.
1969 · Offprint from:
by HALLIDAY, Ian.
Offprint from:: Publications of the Astronomical Society of the Pacific, Vol. 81, No. 480, June 1969. At head of title: Canada Department of Energy, Mines and Resources, Observatories Branch, Contributions from the Dominion Observatory, Ottawa, No. 267., 1969. 8vo. (285)-287 pp. Printed wrappers. Fine. (Inventory #: S5868)