Many primary sources are available online through commercially paid, subscription databases in libraries.
The U-M Library subscribes to or purchases many commercially available collections which are accessible to currently affiliated U-M faculty, staff and students on campus and remotely. Many of these are also available through selected guest workstations on campus to the visiting scholars and the general public.
Examples of paid databases which the U-M Library provides access to are:
Many primary sources can also be viewed online for free in digitized collections.
These can be found through U-M research guides, by searching the web, and by reviewing bibliographies and footnotes for collections relevant to your research interests.
Examples of free digitized collections are: