Title: Proceedings of open meetings of working groups on physical sciences of the nineteenth plenary meeting of COSPAR, Philadelphia, Pennsylvania, USA, 8-19 June 1976 and COSPAR/IAGA Symposium on Minor Constituents and Excited Species, Philadelphia, Pennsylvania, USA, 9-10 June 1976
Subjects: Astronautics in astronomy, Astronautics in geophysics, Astronautics in meteorology, Congresses, Space sciences