Halley's Comet

20th ESLAB Symposium on the exploration of Halley's comet : proceedings of the international symposium, Heidelberg, Germany 27-31 October 1986 / [ed. by B. Battrick, E.J. Rolfe & R. Reinhard]schema:ProductModel 20th ESLAB Symposium on the exploration of Halley's comet : proceedings of the international symposium, Heidelberg, Germany 27-31 October 1986 / B. Battrickschema:ProductModel 20th ESLAB Symposium on the exploration of Halley's comet : proceedings of the international symposium, Heidelberg, Germany 27-31 October 1986 / B. Battrickschema:ProductModel 20th ESLAB Symposium on the exploration of Halley's comet : proceedings of the international symposium, Heidelberg, Germany 27-31 October 1986 / B. Battrickschema:ProductModel