The Heart of Darkness
in The Living Age (Boston, MA, USA) (Jun 16, 1900 — Aug 4, 1900):
Vol. 225 (Jun 16, 1900): 
pp.664–729
Vol. 225 (Jun 23, 1900): pp.728–793
Vol. 225 (Jun 30, 1900): pp.793–848
Vol. 226 (Jul 7, 1900): pp.1–71
Vol. 226 (Jul 14, 1900): pp.72–136
Vol. 226 (Jul 21, 1900): pp.136–201
Vol. 226 (Jul 28, 1900): pp.200–265
Vol. 226 (Aug 4, 1900): pp.264–337
pp.664–729 Vol. 225 (Jun 23, 1900):
pp.728–793 Vol. 225 (Jun 30, 1900):
pp.793–848 Vol. 226 (Jul 7, 1900):
pp.1–71 Vol. 226 (Jul 14, 1900):
pp.72–136 Vol. 226 (Jul 21, 1900):
pp.136–201 Vol. 226 (Jul 28, 1900):
pp.200–265 Vol. 226 (Aug 4, 1900):
pp.264–337 - First serialized in Blackwood's Magazine (Edinburgh, UK) (Feb 1899 — Apr 1899)
- Subsequently extracted as Heart of Darkness in The Manchester Weekly Times and Examiner (Manchester, UK) (Apr 21, 1899)
- Subsequently extracted as On the Congo in The Otago Witness (Dunedin, New Zealand) (Jun 29, 1899)
- Collected as Heart of Darkness in Youth, a Narrative; and Two Other Stories (1902)
- Subsequently extracted as The Centre of Commerce in The Evening Post (Wellington, New Zealand) (Jul 25, 1908)
- Subsequently extracted as Victory in The Miami Herald (Miami, FL, USA) (Jun 1, 1920)
- Subsequently serialized as Coeur de Tenèbres in La Nouvelle Revue Française (Paris, France) (Dec 1924 — Feb 1925)
- Subsequently serialized in The Golden Book (New York, NY, USA) (Jan 1933 — Apr 1933)
View in Internet Archive BookReader (experimental). 
no. 225: pp.665-72, 750-5, 812-21.
no. 226: pp.21-7, 90-7, 153-7, 221-8, 284-94.