@misc{_Observance,
 address={Chathan},
 howpublished={online},
 publisher={[s.n.]},
 language={eng},
 type={druk},
 title={Observance of Mikolaj Kopernik 500th anniversary of birth : The Polish Canadian Club – Chathan, Ont. Saturday, April 14th, 1973},
 keywords={Kopernik, Mikołaj (1473-1543)},
}