Whilst surfing the net I came across this very interesting site that is all about Dry Stone Walls particulaly in the Pennines, it covers the Following Subjects:
1 Walls in the landscape
Characteristic regional walls
Walls in history
Wall dating
2 Dry stone walls and conservation
3 Walls and the law
4 Safety, equipment and organisation
5 Know your stone
6 Rebuilding a free standing wall
7 Technical walling
8 Retaining walls and stone hedges
9 Standard wall furniture
10 Dry stone features
11 Variations in walling
[url="http://handbooks.btcv.org.uk/handbooks/content/section/1580"]Click Here to View this site[/url]