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1858 Plate XVIII: General diagram … Survey Book (General diagram of the tria … |
1858 Plate XIX: Principal Triangu … Survey Book Principal Triangulation. Pla … |
1858 Plate XX: Principal Triangul … Survey Book Principal Triangulation. Pla … |
1858 Plate XXII: Principal Triang … Survey Book Principal Triangulation. Pla … |
1858 Plate XXIII: Principal Trian … Survey Book Principal Triangulation. Pla … |