The comet Halley dust and gas environment proceedings of a joint NASA/ ESA working group meeting held in Heildelberg, Germany on 26 and 27 August 1981 NASA/ ESA Working Group Meeting on the Comet Halley Dust and Gas Environment Germany 1981 Aug. 26-27 creator Battrick, B., ed. text xx Paris European Space Agency 1981 9999 monographic eng
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iiii, 85p. edited by B. Battrick Astronomy and astrophysics thesaurus Comet Halley 523.642-823 ESA 211028