Aeromagnetic and related data were digitized from 1976 magnetic field
and survey route location maps of western Afghanistan. The magnetic
field data were digitized along contour lines from 33 maps in a series
entitled 'Map of Magnetic Field of Afghanistan (Western Area) Delta-Ta
Isolines,' compiled by V. A. Cnjagev and A. F. Bukhmastov. The survey
route location data were digitized along flight-lines located on 33
maps in a series entitled 'Survey Routes Location and Contours of
Flight Equal Altitudes. Western Area of Afghanistan,' compiled by
Z. A. Alpatova, V. G. Kurnosov, and F. A. Grebneva.