Microfilm copies of Ordnance Survey maps 1st edition Ordnance Survey 25-inch maps: Derbyshire Sheet 22.1 - 16 22 Derbyshire Sheet 23.1 - 16 23 Derbyshire Sheet 24.1 - 16 24 Derbyshire Sheet 25.1 - 16 25 Derbyshire Sheet 26.1 - 16 26 Derbyshire Sheet 27.1 - 4, 7, 8, 11, 12, 15, 16 27 Derbyshire Sheet 28.1 - 16 28 Derbyshire Sheet 29.1 - 16 29 Derbyshire Sheet 30.1 - 16 30 Derbyshire Sheet 31.1 - 11, 13 31 Derbyshire Sheet 31A.1 31A Derbyshire Sheet 32.3, 4, 8, 16 32 Derbyshire Sheet 33.1 - 16 33 Derbyshire Sheet 34.1 - 16 34 Derbyshire Sheet 35.1 - 16 35 Derbyshire Sheet 36.1, 5, 9, 13 36 Derbyshire Sheet 37.1 - 16 37 Derbyshire Sheet 39.1 - 16 39 20th cent