Aeromagnetic data were digitized from aeromagnetic maps created from
aeromagnetic surveys flown in southeastern and southern Afghanistan
in 1966 by PRAKLA, Gesellschaft fur praktische Lagerstattenforschung
GmbH, Hannover, Germany, on behalf of the 'Bundesanstalt fur
Bodenforschung', Hannover, Germany. The digitization was done along
contour lines, followed by interpolation of the data along the original
survey flight-lines. Survey and map specifications can be found in two
project reports, 'prakla_report_1967.pdf' and 'bgr_report_1968.pdf',
made available in this open-file report.