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