411 REFERENCE · Wikibooks
World Stamp Catalogue/U
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
U
Uganda
Ukraine
Umm Al Qiwain
United Arab Emirates
United Kingdom, Great Britain
United Kingdom, Great Britain Offices Abroad
United Kingdom, Guernsey
United Kingdom, Isle of Man
United Kingdom, Jersey
United Kingdom, Lundy
United Nations
United States of America
Upper Senegal & Niger
Upper Silesia
Upper Volta
Upper Volta
Uruguay
US Post Abroad
USSR
Uzbekistan