Piece
Catalogue reference: KV 3/2
This record is about the Invisible ink and secret writing: first volume on World War 1 secret writing dating from 1917-1919 in the series The Security Service: Subject (SF series) Files. It is held at The National Archives, Kew.
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Invisible ink and secret writing: first volume on World War 1 secret writing
KV 3
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Invisible ink and secret writing: first volume on World War 1 secret writing
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