Pages are added to the individual categories by adding an attribution tag to the page which contains material sourced from the web site indicated. This forms part of the Tractor Wiki system of crediting sources.
For other sources of copyright free content (under a Creative Commons or similar license) see:
- Category:Pages with content from Ritchie Wiki
- Category:Pages with content from Traktorenlexikon (In German)
- Category:Pages with content from WP - Wikipedia
- Category:Images from Flickr
- Category:Images From Wikipedia or Wikimedia - Including Commons, Wikinews, wikibooks etc
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