This category is within the scope of WikiProject Years, a collaborative effort to improve the coverage of Years on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.YearsWikipedia:WikiProject YearsTemplate:WikiProject YearsYears articles
This category is within the scope of WikiProject Countries, a collaborative effort to improve the coverage of countries on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.CountriesWikipedia:WikiProject CountriesTemplate:WikiProject Countriescountry articles
Other : add {{WPCountries}} to talk pages of related articles, and assess.
Start a discussion about improving the Category:20th-century decades by country page
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