This primary source comes from the Records of the National Park Service.
National Archives Identifier:
519868Full Citation: Lake and mountains , 'McDonald Lake, Glacier National Park,' Montana; 1933 - 1942; Records of the National Park Service, Record Group 79. [Online Version, https://www.docsteach.org/documents/document/lake-and-mountains-mcdonald-lake-glacier-national-park-montana, May 3, 2024]