River. TheOregonEncyclopedia. Portland State University and theOregon Historical Society. [May 19, 2014]. (原始内容存档于2020-12-04). Facts About the Willamette
Shipyards. TheOregonEncyclopedia. Portland State University, Oregon Historical Society. [2019-02-08]. (原始内容存档于2023-08-10). Tom Vogt. Working on the war effort
Template:OregonEncyclopedia Portland State University Columbia River Gorge National Scenic Area Collection -- contains research material used to write the book