Check the author's website (if he has one), the publisher's website, Feedbooks, manybooks.net and smashwords. If you can't find it free in any of those places, it is almost certainly not available for free legally.
Certain groups of writers seem to have recognized the advantage of giving their older books away more so than others. Romance and Sci-fi/Fantasy authors seem most likely (well, along with Indie authors), and often older more established authors are more reluctant (Their are exceptions though).
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Bill
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