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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

Diagram showing the principa …

Survey Book

Diagram showing the principa …