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In page Cartography:
"Another motive for deliberate errors is cartographic "vandalism": a mapmaker wishing to leave their mark on the work. Mount Richard, for example, was a fictitious peak on the Rocky Mountains' continental divide that appeared on a Boulder County, Colorado map in the early 1970s. It is believed to be the work of draftsman Richard Ciacci. The fiction was not discovered until two years later.[citation needed] In Switzerland's official maps, mapmakers have hidden illustrations of a hiker, fish, marmot, and more for over a century.[3]
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