Space research XVI  proceedings of working groups on physical sciences of the eighteenth plenary meeting of COSPAR, Varna, Bulgaria, 29 May - 7 June 1975, and COSPAR symposium and workshop on results from coordinated upper atmosphere measurement programs, Varna, Bulgaria, 29-31 May 1975. 
edited by Michael J. Rycroft 
 - International Council of Scientific Unions 
 - Berlin   Akademie-Verlag  1976 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CosparSpace ScienceAstronomy
<br/><br/><label>Universal Decimal Class. No.: </label>06.055  / COS