NORDWAND
polygraficum WEB ARCHIVES polygraphicum
https://web.archive.org/web/20091116081143/http://www.polygraphicum.de/alpen.html
jungfrau.lithograph by george barnard.london
https://web.archive.org/web/20091126173547/http://www.polygraphicum.de/ParisFrankreichVaria.html
web archives
https://web.archive.org/web/20080622060939/http://www.polygraphicum.de/Schweiz.html
https://web.archive.org/web/20100108042937/http://www.polygraphicum.de/Italien.html
1980-2022