U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 28, 2025
Requesting parties must serve subpoenas:
(a) For Congressional Research Service matters: Director, Congressional Research Service, LM 203, Library of Congress, Washington, DC 20540.
(b) For Law Library matters: Law Librarian, LM 240, Library of Congress, Washington, DC 20540.
(c) For all other matters: General Counsel, LM 601, Library of Congress, Washington, DC 20540.
