Interesting question, I can think of a lot of series that would not be all that great as stand-alone books (Prydan series - Book of three, etc., LotR). It is hard to know exactly which books were written to be stand-alone, especially as time passes. Also, some were probably good ideas, but just didn't work out all that well, like novellas extended to novel-length books but just didn't have the content for it.
How about books that are not specifically series, but set in the same milleu - Saberhagen's "Berserker" series, for example?
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