What follows is a tiny selection of what's available. Browse OpenDOAR's list of recommended repositories for more suggestions. And see the previous tab for ways of searching across many repositories at once.
Peking University (Beijing)
Data compiled by the UK government on all kinds of topics. Includes, for instance, material on museums and public engagement with the arts.
A large repository of material from diverse sources. Also functions as a tool for annotation, collaboration and organising personal collections of documents. Create a free account to access.
A large general repository, useful for finding extra scholarly material about business studies and art markets in particular.
Pre-publication versions of social science papers. Useful for some areas relevant to SIA, such as art crime.