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These are open-access websites:
American Museum Congo Expedition
The American Museum of Natural History Congo Expedition digital collection, which includes text and multi-media resources
Full-text, PDF archive of the serials that first published the work of Joseph Conrad
Study Guide to Joseph Conrad's Heart of Darkness
From Prof. Lyman Baker at Kansas State University
Biographical information, cultural context, and literary criticism from The Victorian Web
Library photo courtesy of Barry Halkin Photography