@misc{_Mai_1941,
 copyright={Public Domain},
 howpublished={online},
 year={1941},
 language={ger},
 title={Mai 1941},
 URL={http://rcin.org.pl/Content/130871/PDF/KOR001_163497_1941.pdf},
 keywords={climatology, meteorology, meteorological data, weather station},
}