Try this:
1. Open ADE, find the first book you want to delete and highlight it by clicking on it ONCE. (Twice will try to open it.)
2. Click the little arrow to the left of the first letter of the title.
3. A short menu will open. Select Delete Item. Since you've already deleted the books from the folder, you might get an error message saying something like "Can't find this file; delete from list?" Click on OK or yes (it's been awhile; I've forgotten exactly what comes up) and it'll be deleted from the library!
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