described at URL: https://www.flickr.com/photos/puroticorico/3647919971/ operator: Flickr URL: https://live.staticflickr.com/3344/3647919971_c9a482c1ae_o.jpg
2017 Source U.S. National Park Service (http://npmaps.com/wp-content/uploads/oregon-trail-map.pdf) Author U.S. National Park Service, restoration/cleanup
2017 Source U.S. National Park Service (http://npmaps.com/wp-content/uploads/california-trail-map.pdf) Author U.S. National Park Service, restoration/cleanup
not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply