What is the U.S. Congressional Serial Set added to HeinOnline?

The United States Congressional Serial Set, "commonly referred to as the Serial Set, began publication with the 15th Congress, 1st Session (1817). The Serial Set contains the House and Senate Documents and the House and Senate Reports.

HeinOnline has the added features of being able to use the Serial Set volume number or citation to retrieve the content. "Each search result contains a document summary. The document summary includes useful information such as the document type, title, volume number, document number, congress-session, year, preferred citation, Bluebook citation, and Serial Set citation" for more details on how to search and use this resource see https://heinonline.org/HeinDocs/U.S.CongressionalSerialSet.pdf.