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1971 deaths
Discoverers of asteroids
Discoverers of comets
1891 births
Astronomical instrument makers
People from Joensuu
Optical engineers
20th-century astronomers
Astronomy-optics society
Discoveries by Yrjö Väisälä
Finnish Esperantists
Finnish astronomers
Finnish geodesists
People associated with the University of Turku

Yrjö Väisälä: history

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