[South Africa 1:250,000 aeromagnetic and airborne radiometric surveys] [South Africa 1:250 000 lugnagnetiese en lugradiometriese opname] Piet Retief area Gebied Piet Retief
Geological Survey (South Africa) Map Studio Productions, pty. ltd; Aero Service Corporation
Pretoria Government Printer 1975?
Localização: IGC - Instituto de Geociências (MP M4-277 )(Acessar)