In addition to article databases like Sociological Abstracts for searching the secondary literature, the UM Library provides access to a number of full text digital collections databases with historical documents. You can browse all library databases by subject in Search Tools. Some examples:
Primary Sources Primer
An introduction to the nature of primary sources and how to find them at the University of Michigan, including resources on campus, outside of UM, government sources, and digital collections.
Finding Archives and Manuscripts
This guide provides an overview of strategies for locating primary sources, including archival and manuscript material.
United States Government Information
This guide will help users find primary source information, documents, reports or publications produced by the legislative, executive and judicial branches of US federal government.
Subject guide to finding and using geospatial data. Includes tutorials for using elevation data to make contours, and using aerial imagery layers to output imagery even more efficiently than Google Earth Pro can.