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Catalogue reference: OS 3/435
This record is about the 'A Portable Magnetometer of the Null Type': Ordnance Survey; published by HMSO dating from 1930 Jan 01-1930 Dec 31 in the series Ordnance Survey: Miscellanea. It is held at The National Archives, Kew.
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'A Portable Magnetometer of the Null Type': Ordnance Survey; published by HMSO
OS 3
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'A Portable Magnetometer of the Null Type': Ordnance Survey; published by HMSO
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