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 
edited by B. Battrick                                                   
 - Paris  European Space Agency  1981 
 - iiii, 85p. 
 - ESA SP; 174 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy and astrophysics thesaurus<br/>Comet Halley
<br/><br/><label>Universal Decimal Class. No.: </label>523.642-823  / ESA