I like Bernard's idea. Using Virtual Libraries is a cleaner solution. They're fairly new, so I tend to think of them less as a solution, but they'd be fine here. Wouldn't work if you need to actually _hide_ books from each other, since there would be the "All Books" virtual library visible. But that doesn't seem to be the issue here. (Might be if you had kids, for example, who shouldn't have access to certain books.)
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