Books on Aspect in Greek

I was musing today while perusing Amazon.

Mari Olsen’s A Semantic and Pragmatic Model of Lexical and Grammatical Aspect (Outstanding Dissertations in Linguistics) has been on my wish list for some time. It’s published by Routledge and Amazon lists it as the “Revised Edition.”

So I’m wondering: Just how revised is it?

Because I could just as easily order a PDF off ProQuest for $37. That’s a lot less than $124. A whole lot less.

I wonder.

Do you think its $87-worth revised?