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O’Donoghue, Y. (1972). <em>William Roy 1726-1790; Pioneer of the Ordnance Survey</em>. London: British Museum, first edition, 56pp. Paperback,

O’Donoghue, Y. (1972). William Roy 1726-1790; Pioneer of the Ordnance Survey. London: British Museum, first edition, 56pp. Paperback,. Ordnance Survey.

Portlock, JE (1869). <em>Memoir of the Life of Major-General Colby, together with a Sketch of the Origin and Progress of the Ordnance Survey of Great Britain and Ireland: </em>

Portlock, JE (1869). Memoir of the Life of Major-General Colby, together with a Sketch of the Origin and Progress of the Ordnance Survey of Great Britain and Ireland: . Skeely Jackson.

Thwaite, Ann (2002). Glimpses of the Wonderful; the Life of Philip Henry Gosse, 1810-1888. London: Faber and Faber. 387pp. Faber and Faber.