Thomson's Map, 1821 (Evident - Marked 'Union Bridge').
Sharp, Greenwood & Fowler's Map, 1826 (Evident - Marked 'Chain Bridge').
Ordnance Survey (1857) 25 Inch to the Mile: Ordnance Survey, London.
New Statistical Account of Scotland (Completed 1834, Published 1845) pp161-162.
Groome F. H. (1883) Ordnance Gazetteer, p281.
Lady Furness (1971) 'Netherbyres' Proceedings Of The Berwickshire Naturalists' Club, Vol XXXIX, pp14-15.
Hume J.R. (1976) The Industrial Archaeology Of Scotland, Vol 1 pp82-83.
'Captain Sir Samuel Brown Of Netherbyres' (1986) Proceedings Of The Berwickshire Naturalists' Club, Vol XLIII, pp73-79.
NMRS Photographic Records.
Cruft K, Dunbar J, Fawcett R (2006) The Buildings Of Scotland ' Borders. Yale University Press: London, p739.