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This is a tracking category. It builds and maintains a list of pages primarily for the sake of the list itself. They are not part of the encyclopedia's categorization scheme.
This category tracks pages tagged with {{Refideas}} using the 'f1' parameter to indicate free content.
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This category contains pages which transclude {{Refideas}} and specify that some of the given references are public domain or released under a free license compatible with Wikipedia. You can help by incorporating content from the sources given into the articles (make sure that you follow license restrictions, for non-public domain resources).