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I have it bookmarked at home but I am at the library right now. If you have an Excel or Word document that has 25 ISBNs on it, by clicking on this thingy, you can load them all into your shelf.
Go to "My Account" - "Post Books". Then use the menu at the top to click on "Post a File of ISBNs".
I'd try to link but I don't think it would work because we're different users.
Is that what you're looking for?