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www.fc.up.pt
European Journal
of Mineralogy (http://www.univie.ac.at/Mineralogie/EMU/welcome.htm)
www.cm-porto.pt
www.enterportugal.com/porto.html
www.justportugal.org/portugal/oporto
www.cavesvinhodoporto.com
www.douronet.pt
www.tap.pt
www.cp.pt
www.stcp.pt
www.metrodoporto.pt
www.douroazul.pt
http://travel.nytimes.com/travel/guides/europe/portugal/oporto/overview.html
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