Portrait of Jack London taken in 1903.
Image from Little Pilgrimages Among the Men Who Have Written Famous Books: second series by E.F. Harkins, published by L C Page and Company Boston 1903 - https://archive.org/details/littlepilgrimage00harkuoft (Little Pilgrimages page 235).
By Cantwell, George G. - Library University Washington; first published in 1900, "The Klondike, a souvenir", Rufus Bucks Publisher, Seattle, 1900 (no page numbers). Digitally altered image to remove caption at lower left (see uploaded version for original)., Public Domain, https://commons.wikimedia.org/w/index.php?curid=17281180
Klondike routes map. The section connecting Dyea/Skagway with Dawson is referred to by London as the "Yukon Trail".
Klondike Routes Map from w:National Park Service; cropped from: http://www.nps.gov/klgo/planyourvisit/upload/KlondikeRoutes.pdf (http://www.nps.gov/klgo/planyourvisit/maps.htm)