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Unless you are getting more than 1k unique visitors a day, I wouldn't bother with adsense. Also, like Adam said, you may not find it too effective with the repeat visitors.
But, let me throw this idea out for you.
Since your site has a very specific focus, you might try doing an amazon or barnes&noble affiliate program. You can choose the types of ads you want, and its obvious to users that they help support the site.
You could also have some book reviews (with 'buy' links, of course) and articles (that reference books as sources).
This will make your site useful for visitors and the constant new content makes for the best kind of SEO.
Amazon even sells accessories and toys for pools so, you could do more than just books.
Plain honest information can also build trust with your site's visitors.
At your current traffic level, you could see pretty good results right away.
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