THE FIRST DROPDOWN BOX
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| The county prefix is a 3 letter code. | |||
| ANT | Antrim | FER | Fermanagh |
| ARM | Armagh | LDY | Londonderry/Derry |
| DOW | Down | TYR | Tyrone |
| The county prefix for Intertidal Marine sites is | |||
| MRA | Antrim | MRD | Down |
| MRL | Londonderry/Derry | ||
THE SECOND TEXT BOX
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The number of the 6" OS county series map, or for Co. Fermanagh, the 1:10,000 IG map. |
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| e.g. | DOW | 012 | |
THE THIRD TEXT BOX
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| The individual number of the site on that map sheet. | |||
| e.g. | DOW | 012 | 023 |