Reid, James. (2017). The GB Meridian, [Dataset]. University of Edinburgh. https://doi.org/10.7488/ds/1933.
The location of the GB central meridian. Lineage unknown. GIS vector data. This dataset was first accessioned in the EDINA ShareGeo Open repository on 2010-09-03 and migrated to Edinburgh DataShare on 2017-02-22.
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