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Geek Trivia: Map Makers Include What Device To Identify Their Maps In Lawsuits?

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Map Makers Include What Device To Identify Their Maps In Lawsuits?
  1. Paper Towns
  2. Watermarks
  3. Micro Text in the Compass Rose
  4. Ultraviolet Ink

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from How-To Geek https://www.howtogeek.com/trivia/map-makers-include-what-device-identify-their-maps-in-lawsuits/
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