The Nineteenth Annual COSPAR Meeting and five associated symposia were held in June 1976 in Philadelphia at the invitation of the National Academy of Sciences. Nearly 500 papers were presented during the open sessions of COSPAR working groups and panels and during the specialized symposia. Total participation was 634 from 33 countries. Of the 34 national scientific institutions in COSPAR, 32 were officially represented, as were 9 international scientific unions of the 12 in COSPAR. Fourteen invited intergovernmental and nongovernmental international organizations sent official representatives.