@misc{_Jerzy,
 copyright={Public Domain},
 howpublished={online},
 type={Image},
 title={Jerzy Szulczewski},
 URL={http://rcin.org.pl./Content/133485/PDF/WA058_152444_Szulczewski_Jerzy.pdf},
 keywords={Szulczewski, Jerzy (1879-1969), naturalists, physiographers, teachers, biologists - Poland - biography},
}