Gola del Columbia: differenze tra le versioni
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*{{cita web|http://www.gorgecommission.org/|Columbia River Gorge Commission|lingua=en}}
*{{cita web|http://columbiagorge.com/|Columbia Gorge Magazine|lingua=en}}
*Carl Abbott, [https://web.archive.org/web/20131121001446/http://www.oregonencyclopedia.org/entry/view/columbia_gorge_national_scenic_act/ "Columbia Gorge National Scenic Area"], sull'[http://www.oregonencyclopedia.org/ ''Oregon Encyclopedia'']
*{{en}} {{collegamento interrotto|1=[http://archon.archives.pdx.edu/index.php?p=collections/controlcard&id=26 Portland State University Columbia River Gorge National Scenic Area Collection] |date=settembre 2017 |bot=InternetArchiveBot }} - contiene materiale di ricerca usato per scrivere il libro ''Planning a New West: The Columbia River Gorge National Scenic Area''
*{{en}} [http://watch.opb.org/video/1249386699 "The River They Saw"] - Documentario prodotto dalla [[Oregon Public Broadcasting]]
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