3 links
Marcel Duchamp - Olga's Gallery
abcgallery.com
Collection of artist's works with a biography and historical comments.
Tout-Fait - Marcel Duchamp Studies Online Journal
toutfait.com
Journal focusing on the French-American artist Marcel Duchamp.
Understanding Duchamp - Retrospective
understandingduchamp.com
Presents artist's biography and images of his works.