On the Hathi Trust Digital Library, you can build "collections" - items around a particular theme, often between a specified period of time and/or tied to a particular location. These "collections" of items transfer into Hathi Trust's Research Center as "worksets", where you can analyze these groups of text with a specific purpose using a variety of algorithmic approaches.
Worksets have two primary functions:
Organizational
- Gather material of interest in one place
- Search/metadata criteria to "slice and dice" results into a usable workset (e.g. a subset of a larger workset/collections)
Algorithmic
- Delimit the scope of the analysis to a certain feature or element
- Execute an analysis on your workset and observe
Learn how to create a workset in the HTRC documentation: https://wiki.htrc.illinois.edu/x/cIFnAQ. (You will need a HathiTrust login to access their wiki.)