Map of Liverpool UK 1835 Info:?

I have a map on my wall that shows the Township of Liverpool cira 1835,it shows the town north of the Mersey River it covers the area of Edge hill&Toxteth Park,Kirkdale.&Everton Low Hill.The map is engraved on linen & shows all streets by name plus the docks.Can any one help me in regards to the value of this map or point me in the right direction in finding out more info