| | | Date | Description | Links | MSA Citation |
| | Details | 1964 | Bromery, R.W., Petty, A.J., and Smith, C.W., 1964, Aeromagnetic Map of Bel Air and Vicinity, Harford, Baltimore, and Cecil Counties, Maryland: Washington, D.C., U.S. Geological Survey Geophysical Investigations Map GP-482, 1 sheet, scale 1:62,500. | | SE81-1 |
| | Details | 1974 | U.S. Geological Survey, 1974, Aeromagnetic Map of Eastern Dorchester County, Maryland, and Parts of Adjacent Counties: Washington, D.C., U.S. Geological Survey Geophysical Investigations Map GP-898, 1 sheet, scale 1:62,500. | | SE81-2 |
| | Details | 1971 | U.S. Geological Survey, 1971, Aeromagnetic Map of Part of Cecil County, Maryland, and Parts of Adjacent Counties in Maryland and Delaware: Washington, D.C., U.S. Geological Survey Geophysical Investigations Map GP-755, 1 sheet, scale 1:62,500. | | SE81-3 |
| | Details | 1974 | U.S. Geological Survey, 1974, Aeromagnetic Map of Southern Queen Anne's County, Maryland, and Parts of Adjacent Counties: Washington, D.C., U.S. Geological Survey Geophysical Investigations Map GP-900, 1 sheet, scale 1:62,500. | | SE81-4 |
| | Details | 1974 | U.S. Geological Survey, 1974, Aeromagnetic Map of Western Dorchester County, Maryland, and Parts of Adjacent Counties: Washington, D.C., U.S. Geological Survey Geophysical Investigations Map GP-899, 1 sheet, scale 1:62,500. | | SE81-5 |
| | Details | 1964 | Bromery, R.W., Petty, A.J., and Gilbert, F.P., 1964, Natural Gamma Aeroradioactivity Map of Bel Air and Vicinity, Harford, Baltimore, and Cecil Counties, Maryland: Washington, D.C., U.S. Geological Survey Geophysical Investigations Map GP-484, 1 sheet, scale 1:62,500. | | SE81-6 |