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Conheça alguns sites selecionados.

- UK Philately - England
http://www.ukphilately.org.uk/


- Ukraine Post
http://www.ukrposhta.com/www/upostua.nsf/index?OpenPage


- União Postal das Américas, Espanha e Portugal (UPAEP)
http://www.upaep.com.uy


- União Postal Universal (UPU)
http://www.upu.int


- Union Marcophiles (UM) - France
http://union-marcophiles.com


- Union of Czech Philatelists
http://www.japhila.cz/scf


- Union of Swiss Philatelic Societies
http://www.vsphv.ch


- United Postal Stationary Society - U.S.A.
http://www.upss.org


- United States Postal Services
http://www.usps.com/news/2001/press/


- Uruguay Post
http://www.correos.com.uy