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1858 Plate XXIV: Principal Triang … Survey Book Principal Triangulation. Pla … |
1858 Plate XXV: Principal Triangu … Survey Book Principal Triangulation. Pla … |
1858 Plate XXVI: Principal Triang … Survey Book Principal Triangulation. Pla … |
1858 Plate XXVII: Interior of Zen … Survey Book Interior of Zenith Sector Ob … |
1858 Diagram showing the principa … Survey Book Diagram showing the principa … |