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1858 Plate XVIII: General diagram of the tria … Survey Book (General diagram of the triangulation, s … |
1858 Plate XIX: Principal Triangulation Survey Book Principal Triangulation. Plate XIX. (to … |
1857 Index to the Ordnance Survey of Ireland Survey Book Index to the Ordnance Survey of Ireland … |
1857 Co. Donegal : Specimen with hills engrav … Survey Book Co. Donegal : Specimen with hills engrav … |