The Serial Set Maps collection is a collection of more than 70,000 maps printed as part of the Congressional Serial Set. With the High-Resolution Maps Module, more than 50 percent of these are scanned at high resolution enabling users to see and download the smallest details on the map.
Source: Proquest LibGuide on Serial Set Maps
Example:
Example: Failure of negro colonization in Mexico, with names list and railroad transportation charges (House and Denate Document, Date: January 27, 1896)