Microfilm copies of Ordnance Survey maps 1st edition Ordnance Survey 25-inch maps:Derbyshire Sheet Derbyshire Sheet 1.13, 14, 16 Derbyshire Sheet 2.3, 4, 7, 8, 10 - 16 Derbyshire Sheet 3.1, 5, 9, 13 Derbyshire Sheet 4.9, 10, 13 Derbyshire Sheet 5.1 - 16 Derbyshire Sheet 6.4, 7 - 9, 13, 15, 16 Derbyshire Sheet 7.1, 2, 5, 6, 9, 10, 12 - 15 Derbyshire Sheet 8.1, 4, 7, 8, 11, 12, 15, 16 Derbyshire Sheet 9.1 - 16 Derbyshire Sheet 10.1 - 16 Derbyshire Sheet 11.6 - 16 Derbyshire Sheet 12.1, 4 - 16 Derbyshire Sheet 13.1, 5, 9, 10, 13, 14 Derbyshire Sheet 14.3, 4, 7, 8, 11, 12, 16 Derbyshire Sheet 15.1 - 16 Derbyshire Sheet 16.1 - 16 Derbyshire Sheet 17.1 - 5, 7 - 9, 11 - 16 Derbyshire Sheet 18.1 - 16 Derbyshire Sheet 19.1 - 16 Derbyshire Sheet 20.5 - 9 Derbyshire Sheet 21.4, 8, 12 Derbyshire Sheet 22.1 - 16 Derbyshire Sheet 23.1 - 16 20th cent