In the Master Source window for books, could you add ISBN and Library of Congress number fields under Publish Date ? Although these might be considered Repository Call Numbers, because they are so ubiquitous and are printed on the Publication Page of virtually every book, it would make it a lot easier to find in a library and/or on the WWW. These fields could be made optional with a "More" button. (FWIW, even though Evidence Explained doesn't address ISBN's, it has one.)
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