Spider and Harvestman Recording Scheme website
the national recording schemes for spiders and harvestmen in Britain.
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TL6382559848
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100 km square
Hectad (10 km square)
Quadrant (5 km square)
Tetrad (2 km square)
Monad (1 km square)
6 figure GR (100 m square)
8 figure GR (10 m square)
10 figure GR (1 m square)
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