Retrieved 2009-10-23.CS1 maint: Unfit url (link) "Replacing lower Snake River dams would cost Northwest $413 million to $565 million annually" (PDF).
בדיקה אחרונה ב-23 באוקטובר 2009.  "Replacing lower Snake River dams would cost Northwest $413 million to $565 million annually" (PDF).