Copenhagen: Copenhagen University Observatory, 1970.
Trade Paperback. Good with no dust jacket. Item #6236
Library stamps/marks/labels/pocket, spine tape reinforced, cover fade, light wear. Solid trade paperback.; Proceedings of the Colloquium held in Elsinore, Denmark, 15-19 September 1969, sponsored by the International Astronomical Union.; Proceedings of the IAU Colloquium; Ex-Library; Vol. 6; 238 pages.