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Searching the Federal Register
You can also search the Federal Register on Westlaw or Lexis. The advantage is that you can search the whole thing at once and also use the sophisticated search features of the systems.
History of a Regulations
Sometimes you want to trace the development of a regulation. On Westlaw, you can look at the Credits which lists the Federal Register citations.
Example: 43 C.F.R. § 2530.0–8.
You can also search the Federal Register.