Avoiding Duplicates?
Is there a setting to make Zotero ignore / discard duplicates during import?
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If you're using Firefox, you can check this out:
https://groups.google.com/forum/?fromgroups=#!topic/zotero-dev/yJLUTttGMXk
I found it to work pretty nicely, but it's FF only and will be for the foreseeable future.