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The Sixteenth Plenary Meeting of COSPAR will be held in Konstanz, West-Germany, May 23–June 6, 1973. In addition to the general meeting there will also be specialized symposia and open meetings of working groups. The topics for the scientific sessions include the approaches to earth survey problems through the use of space techniques; methods of measurements and results of lower ionosphere structure, noctilucent clouds and interplanetary dust.