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Conversation Between D'Alembert and Diderot
http://www.marxists.org/reference/subject/philosophy/works/fr/diderot.htm
Diderot's dialogue of 1769, promoting a materialist explanation of consciousness.
D'Alembert's Dream
http://www.mala.bc.ca/~johnstoi/diderot/revedalembert_tofc.htm
An online English translation of this didactic Diderot drama from 1769.
Positive Atheism's Big List of Denis Diderot
http://www.positiveatheism.org/hist/quotes/diderot.htm
Numerous excerpts from his writings.
Rameau's Nephew
http://www.mala.bc.ca/~johnstoi/diderot/rameau_E.htm
Online English translation by Ian Johnston of this 1762 work by Diderot. Includes links to the French text.