https://uslaw.link is a legal citation resolver. That means you can paste a citation to a legal document --- such as 40 U.S.C. § 11101(1), 118 Stat 3910, Pub.L. 110-84, 5 CFR §531.610(f), and 75 Fed. Reg. 28404 --- and uslaw.link will provide some links for where you can read the law or court case.

The full set of citations that uslaw.link supports are:

• U.S. Code citations like 40 U.S.C. § 11101(1). uslaw.link provides links to the official U.S. Code website uscode.house.gov and the Cornell Legal Information Institute for the most recent code and to the Government Publishing Office's GovInfo.gov site for the most recent published edition of the U.S. Code.
• U.S. "public law" citations like Pub.L. 110-84. uslaw.link provides links to the Legisworks Historical Statutes at Large Data for Congress 1-85 and to the Government Publishing Office's GovInfo.gov site for the 104th Congress forward, plus links to GovTrack.us for their corresponding bills (93rd Congress forward).
• U.S. Statutes at Large citations like 118 Stat 3910. uslaw.link provides links to Legisworks Historical Statutes at Large Data for volumes 1-64 and to the Government Publishing Office's GovInfo.gov site for Statutes at Large volumes 65-125, plus links to GovTrack.us for their corresponding bills (93rd Congress forward).
• Code of Federal Regulations citations like 5 CFR §531.610(f) and Federal Register citations like 75 Fed. Reg. 28404. uslaw.link provides links to the Government Publishing Office's GovInfo.gov site.
• Federal court cases like 410 U.S. 113 and 214 F.3d 416. uslaw.link provides links to Court Listener.
• The United States Constitution like U.S. CONST., art. VI, cl. 2. uslaw.link provides links to Archives.gov and the Constitution Annotated from the Library of Congress.
• District of Columbia laws like DC Law 22-168 and DC Code sections like DC Code 1-1161.01. uslaw.link provides links to code.dccouncil.us.
• Virginia code citations like VA Code § 30-178. uslaw.link proides links to Virginia Decoded.

In addition, when you paste certain types of citations, uslaw.link provides additional parallel citations, meaning other citations that refer to the same law or case. That's because laws and cases often appear in multiple publications, and each publication has a different citation.

• When you paste a Statutes at Large citation, the parallel Public Law citation and links are provided, and the originating U.S. Congress bill number and links to GovTrack.us (93rd Congress forward) and the Government Publishing Office's GovInfo.gov site (103rd Congress forward) are provided. This uses Legisworks Historical Statutes at Large Data for volumes 1-64 and to the Government Publishing Office's GovInfo.gov site for Statutes at Large volumes 65-125.
• When you paste a Public Law citation, the parallel Statutes at Large citation and links are provided using the Government Publishing Office's GovInfo.gov MODS metadata. Additionally, the originating U.S. Congress bill number and links to GovTrack.us (93rd Congress forward) and the Government Publishing Office's GovInfo.gov site (103rd Congress forward) are provided, using GovTrack.us's public law database.

Additionally, titles for laws and cases are added and citations are disambiguated by querying:

• The Government Publishing Office's GovInfo.gov MODS metadata.
• The Legisworks Historical Statutes at Large Data.
• Court Listener.
• uscode.house.gov, to check whether a U.S. Code citation is valid.

Citation parsing is performed by the open source citation library at https://github.com/unitedstates/citation.