01023nam0-22002651i-450-990000024500403321000002450FED01000002450(Aleph)000002450FED0100000245020011111d--------km-y0itay50------baitay-------001yySpace research 16.proceedings of Open meeting of working groups on physical sciences of the 18. Plenary meeting ofCOSPAR, Varna, Bulgaria 295-76 1975 and and COSPAR Symposium and Workshop on results from coordinated upper atmosphere measurement programs, Varna 29-31 may 1975organized by COSPAR and Bulgarian Aca. of Scienceed. M.J. Rycroft.BerlinAkademie-verlag1976XIX, 1077 p.ill.25 cm500.5PLENARY MEETING OF COSPAR, 18., Varna, 1975ITUNINARICAUNIMARCBK99000002450040332113 SC V G 2331227FINBCFINBCUNINAING01