Lancashire LXX.NE (6 inch to the mile) - Lancashire LXX.NE (6 inch to the mile)
OS revised: 1928, Geological Survey resurveyed (East of Darwen Valley Fault): 1922, Revised: 1924 to 1932, Published: 1937 Size: map 31 x 46 cm (ca. 12 x 18 inches), on sheet ca. 47 x 67 cm (ca. 18 x 26 inches)