How to retrieve call numbers from items
                    Suppose I have a collection of bibliographic items of books in my Zotero library. I would like to gather all the call numbers of the books.  I wonder in which format(s) I could export the data so I can retrieve the call numbers of the books.  
Many thanks.
                            Many thanks.
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1. Export to csv (right-click collection --> Export --> CSV)
If you open the file in Excel, you can find the callNumber in a column
2. Use a citation style that includes the Call Number. Afaik, this one is the only such style on the repository: https://www.zotero.org/styles?q=id%3Achicago-library-list