----------------------------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]