United States congressional serial set This link opens in a new windowPresenting every publication from the 15th Congress through the 103rd Congress, including items missing from other editions, the Readex U.S. Congressional Serial Set, 1817-1994 contains over 415,000 individual documents in more than 14,000 volumes. Designed for legislative and historical research, the Readex digital edition features unique browse capabilities and comprehensive metadata, offering new research opportunities for students and scholars in cultural, economic, ethnic, government, military, political and science history and other fields. Readex uses the original volumes to create fine new digital images of every publication, including approximately 56,000 maps. Nearly 14,000 maps and more than 8,000 illustrations appear in high-resolution color.