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Citation
A citation is a listing for a law or regulation which includes the title or chapter number, the name of the collection, and the sections and paragraph numbers.
Below are diagrams explaining how to read these notations:

To look up a particular law: Go to USC digital libraries or FedLaw; also see Patent’s 35 USC (laws) [PDF]
Citations of Code of Federal Regulations

To look up a particular regulation: Go to CFR digital libraries; also see Patent’s 37 CFR (rules) [PDF]