Feature Request: Lookup by Library of Congress Control Number

I was recently trying to cite some books, and was unhappy to find that the books had no ISBN number-- they were fifty years old. They were still full of very pertinent historical information, but I had to manually cite the work. Zotero currently supports lookup by ISBN, DOI, and PMID. I think it would also be helpful to allow for lookup by LCCN, which would cover materials published since the late 1800s. I realize adding this in for the 2.0 final release may be a bit of a stretch, but I certainly think it would be possible for 2.1 or later.
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