Microfilm copies of Ordnance Survey maps 1st edition Ordnance Survey 25-inch maps: Derbyshire Sheet 24.1 - 16 Derbyshire Sheet 25.1 - 16 Derbyshire Sheet 26.1 - 16 Derbyshire Sheet 27.3, 4, 7, 8, 12, 16 Derbyshire Sheet 28.1 - 16 Derbyshire Sheet 29.1 - 16 Derbyshire Sheet 30.1 - 16 Derbyshire Sheet 31.1 - 9, 13 Derbyshire Sheet 32.4 - 8 Derbyshire Sheet 33.1 - 16 Derbyshire Sheet 34.1 - 16 Derbyshire Sheet 35.1 - 16 Derbyshire Sheet 36.1, 5, 9, 13 Derbyshire Sheet 38.1 - 16 Derbyshire Sheet 39.1 - 16 Derbyshire Sheet 40.1 - 16 Derbyshire Sheet 42.12, 15, 16 Derbyshire Sheet 43.1 - 16 Derbyshire Sheet 44..1-16 20th cent