Correspondence with Brigadier M. Hotine, Director of Colonial Surveys, G.W. Helen, Secretary of the Directorate, Miss D.H. Emmett, and Lt-Col. B. St G. Irwin, Ordnance Survey Office, Chessington, Surrey, about the Ordnance Survey Officers' Conference, Cambridge, Aug 1955; with some of the papers presented, and a list of representatives. 17 leaves and eight items.