added LAW LIBRARY ineligible. fixes #549
used dictionary key safely, fixes #548
removed duplicate isbns, fixes #547
Merge pull request #551 from gwu-libraries/t548-handle-dictionary-key-safely

used dictionary key safely, fixes #548
Merge pull request #552 from gwu-libraries/t547-de-duplicate-related-isbns

removed duplicate isbns, fixes #547
Merge pull request #550 from gwu-libraries/t549-add-LAW-LIBRARY-to-template

added LAW LIBRARY ineligible. fixes #549