Space research XVI 
/ Proceedings of Open Meetings 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, 29-21 May 1975 
 - Berlin:   Akademie-Verlag,   1976 
 - xix, 1077p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Space sciences	
<br/><br/><label>Subjects--Index Terms: </label>Astronautics in geophysics 
<br/><br/><label>Universal Decimal Class. No.: </label>629.78(082.2)