LACMA (Los Angeles County Museum of Art) Provenance Research Project
Established in 1999, the program's web site focuses on looted art but also includes bibliography and links to other museum websites with provenance Information, such as:

Art Institute of Chicago
Cleveland Museum of Art
J. Paul Getty Museum
Harvard University Museums
Metropolitan Museum of Art
Museum of Fine Arts, Boston
Museum of Modern Art, New York
National Gallery of Art, Washington
National Museums of the United Kingdom
Musées National Récupération [MNR]

British National Museums: Spoliation of works of art during the Holocaust and World War II period

NARA (National Archives and Records Administration Art Provenance and Claims Research Project)
A web site for Holocaust-Era provenance research.

National Museum Directors Conference
A UK Holocaust-Era site that includes reports (Spoliation of works of art during the Holocaust and World War II period) based on collections in numerous national and non-national galleries in England, Scotland and Wales.

Musée des Beaux-arts de Montréal

The National Gallery of Canada's Provenance Research Project
These pages present the National Gallery of Canada's continuing research on the provenance (history of ownership) of works in its collection during the period from 1933 to 1945.