A list of all 870 county tetrads:
Resources/TETRAD List for Shropshire 870 stripped down.xls
Two key maps to show the extent of Ordnance Survey (OS) cover of Shropshire.
Key Map 1. The OS 1:50,000 scale (2cm to 1km, not far off the old "one inch to the mile") 'Landranger' maps.
There are no overlaps in land-cover by 1:50,000 scale maps.
Key map 2. The OS 1:25,000 scale (4cm to 1km) 'Explorer' maps.
There is some duplication of land-cover by 1:25,000 scale maps - the southern edge of map 216 (Welshpool) and the northern edge of map 210 (Knighton) where the two cover the same ground, show by crosses.
Resources/TETRADS of Shropshire 1to25 maps.xls
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