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1858 Plate I: Airy's Zenith-Secto … Survey Book Airy's Zenith-Sector. Plate … |
1847 Plate II: Ordnance Survey: B … Survey Book Ordnance Survey: Base appara … |
1847 Plate III: Ordnance Survey: … Survey Book Ordnance Survey: Base appara … |
1858 Plate XXVII: Interior of Zen … Survey Book Interior of Zenith Sector Ob … |