Öpik, Ernst2023-11-062023-11-0619419789916372678Est.A-15249https://hdl.handle.net/10062/94044estopenAccessAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/meteooridastronoomilised vaatlusedseparaadidObservations of meteor velocities 1931-1938Book