Good undergraduate level book on Cyclotomic fields

I have Lang's 2 volume set on "Cyclotomic fields", and Washington's "Introduction to Cyclotomic Fields", but I feel I need something more elementary. Maybe I need to read some more on algebraic number theory, I do not know.

So I would appreciate suggestions of books, or chapters in a book, lecture notes, etc. that would give me an introduction. I am specifically interested in connection of cyclotomic fields and Bernoulli numbers.

Thank you.

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The book by I&R does not prove the unit theorem or give geometry of number methods for the finiteness of the class group (they use a different approach to bound the class number) but I think other than that it's a more comprehensive volume that Pollard and Diamond. I'd suggest looking at Samuel's Algebraic Theory of Numbers, which does have a section on the cyclotomic field generated by $p$th roots of unity for prime $p$. –  KCd Nov 7 '11 at 5:29