Použité zdroje:
- http://instytutdidaskalos.pl/historia-protestantow/gros-iser-utracony-raj
- https://polska-org.pl/4383473,Wielka_Izera_Izera_Skalno_nie_istnieje.html
- M. Nevrlý : Kniha i Jizerských horách
Virtual Rewards 2.0 - 2019/2020
This Virtual Cache is part of a limited release of Virtuals created between June 4, 2019 and June 4, 2020. Only 4,000 cache owners were given the opportunity to hide a Virtual Cache. Learn more about Virtual Rewards 2.0 on the Geocaching Blog.