----------------------------Original message---------------------------- First of all, please specify which scale maps and of what date: no Web Site (at least, that of the Ordnance Survey at present) is going to carry every single conventional sign - with explanation - of all its productions over the last 200 years! You MIGHT find the answer to your inquiry in 'Ordnance Survey maps: a descriptive manual' by J. B[rian] Harley (Southampton: Ordnance Survey, 1975). It largely depends on what you want - 'current' or 'historic' maps/plans... Yours sincerely Francis Herbert (Curator of Maps, RGS, London; Founder Member, Charles Close Society for the Study of Ordnance Survey maps) [log in to unmask]