Mapping the Heart of the Grand Canyon
https://www.outsideonline.com/2390631/grand-canyon-cartography [www.outsideonline.com]
2019-03-02 01:52
Behind the Herculean effort to create a scientifically accurate cartographic masterpiece
Additional links: https://kottke.org/19/03/the-heart-of-the-grand-canyon-map
source: K