Aeroradioactivity survey and a real geology of the District of Columbia and parts of Maryland, Virginia, and West Virginia (ARMS-I). CEX-59.4.17.
D004219:District of Columbia; D055593:Geological Phenomena; D005844:Geology; D008396:Maryland; D011834:Radiation Monitoring; D011851:Radioactivity; D014768:Virginia; D014903:West Virginia