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200 1 $aSpace research 16.$eproceedings of Open meeting of working groups on physical sciences of the 18. Plenary meeting ofCOSPAR, Varna, Bulgaria 29$f5-7$f6 1975 and and COSPAR Symposium and Workshop on results from coordinated upper atmosphere measurement programs, Varna 29-31 may 1975$forganized by COSPAR and Bulgarian Aca. of Science$ged. M.J. Rycroft.
210   $aBerlin$cAkademie-verlag$d1976
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