Pay per click - articles to improve ads

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Hello everyone,

We've got an intern coming in to improve our Adwords pay per click
ads.  She doesn't know anything about it.
I've been handling this up until now and know what I'm doing.  I'd
like her to do some reading before she comes in so she'll have an idea
what's going on.
I've just spent 30 minutes on Google looking for articles with no
success.  I'm looking for articles with the following titles:
Introduction to Adwords
Weeding out bad keywords
Iterative ad improvement

Does anyone know of a good source?



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