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Statistik Schweiz - Infrastruktur
http://wayback.archive.org/web/20130109123330/http://www.bfs.admin.ch/bfs/portal/de/index/themen/11/03/blank/key/infrastruktur.h
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Statistik Schweiz - Infrastruktur
https://web.archive.org/web/20101114002529/http://www.bfs.admin.ch/bfs/portal/de/index/themen/11/03/blank/key/infrastruktur.html