on the survey methods used by the Commission - mainly traverses fixed by astronomical observations and supplemented by wheel and compass sketches. (From these maps the traverse routes of the Commission could probably be reconstructed). MRLG reference Original 589.
13. Published versions of item 12, designated GSGS 1764. The brown hill drawing of the original drawings has been omitted, and the red names printed in black, thus giving a two colour (black and blue) map. Printed by Ordnance Survey in 1911 with a War Office publication date of 1910. They carry the same notes on surveys as the original drawings, and have had the latitude and longitude graticule extended across the face of the map. MRLG reference E1(12).
14. Printed reductions of the original drawings for GSGS 1764 (item 12), at 1:500,000 scale, with the brown, blue, and red omitted. They bear no series designation. MRLG reference Original 589.
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