Lancashire 70se, 6". Darwen, 1931/1938, black outline, red geology, In fair condition.
Lancashire 70se, 6". Darwen, 1931/1938, black outline, red geology, In fair 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.