Derbyshire 40nw, 6". Bullbridge, 1900/1910, black outline, blue geology.
Derbyshire 40nw, 6". Bullbridge, 1900/1910, black outline, blue geology. Hand coloured at OS in 1915. Minor marginal tears, otherwise in very 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.