Keywords: Henryk Ferdynand Hoyer.jpg en Henryk Ferdynand Hoyer Polish zoologist pl Henryk Ferdynand Hoyer polski zoolog Tygodnik Illustrowany R 43 nr 25 21 VI 1902 retrieved from http //polona pl/item/7996355/12/ anonymous/unknown before 1902 public domain due to its age PD-old |