• Logo for Geocaching. https://www.google.com/search?q=geocaching logo&safe=strict&rlz=1C1CHBF_enUS872US872&source=lnms&tbm=isch&sa=X&ved=2ahUKEwi568qmrojmAhWKu54KHa4KB2IQ_AUoAXoECAoQAw&biw=1920&bih=937#imgrc=6eYeckvpaVfUKM:
• “Satellite Communications: Geocaches as Interpretation (U.S. National Park Service).” National Parks Service, U.S. Department of the Interior, https://www.nps.gov/articles/parkscience32_1_30-35_perez_beotegui_3818.htm.
• “Fast Facts.” Geocaching Newsroom, https://newsroom.geocaching.com/fast-facts.
• Kettler, / Audrey. “3 Million Geocaches: the Infographic.” Official Blog, 19 Apr. 2017, https://www.geocaching.com/blog/2017/04/3-million-geocaches-the-infographic/.

 

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