Northumberland 13sw, 6". Greenhead, Gilsland, 1926/1929.
Northumberland 13sw, 6". Greenhead, Gilsland, 1926/1929. Black outline with blue geology and brown contours. Includes part Northumberland n18. In good condition.
About the England Six Inch County Series (later edition)
These early 20th century geological maps are at 1:10,560 scale, based on county layout. Each sheet covers 2 x 3 miles in considerable detail.