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On your "reading legal citations" page, you indicated that a reader might see 450 US 346 or 450 S.Ct. 346 as equivalent citations to a particular case. That's not quite right. The first is a citation to the "official" U.S. reporter, the second is to "Supreme Court Reports" published (I believe) by West Publishing. However, their citation references are wildly different. Thus, if you're looking for a case at 450 US 346, the same case in the S.Ct. may (and likely will) be found at a cite that is entirely different.