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Naval Staff Monographs: Operational records referenced as "N.L."

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leofielding:
Hello all
I have noticed that various footnotes in the Naval Staff Monographs on Navy operations during the Great War refer to specific original sources in the format "N. L. [Four digit number]/[year]". I am not sure what "N.L." stands for. I wanted to try to clarify what specific source this "N.L." reference is pointing to, and where these "N.L." records may be held today in order to consult them.
Thanks in advance for any pointers!

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