SITE O Regional Sites
 
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British Isles (UK & Ireland)
http://www.forts.org.uk/siteo
 
Low Countries (Belgium, Neth.,Lux) & Germany 
http://www.siteo.mgn.nl
 
Poland, Hungary, Belrus, Ukraine, Russia & possibly Finland
http://www.tpfprzemysl.w.kki.pl/siteo/index.html
 
Iberia (Spain & Portugal) & France
http://delafortification.free.fr/SiteO.htm
 
The Southeast Europe (from Slovenia to Greece), Italy, Switzerland & Austria
http://www.ars-cartae.com/siteo/index.htm
 
Australia, New Zealand and the Pacific
http://homepages.paradise.net.nz/jascadde/index.html