Remembrance Rock estimate 

The article has a 532,030 word count, referenced to the book's amazon.com page.  How, exactly, is this a reference to the word count?

In writing the RR page, I've been going over some original reviews.  One of the NYT reviews gave a word count of "half a million and change".  Guess we'll not cite that.  The WP review, which I cite, gave a count of 650,000, which seems way too high.  So I made my own estimate, and came up with 543,000, see the footnote.

Any suggestions?