Edition: 1ª Edition
Author: Coordination of  Jorge M. A. Miranda and Luís A. Mendes Victor. Collaboration of Isabel P. de Abreu, Joaquim Ribeiro, Maria Ana Baptista, Maria Luísa Contreiras and all the technicians of the Serviço de Geofísica of the Instituto Nacional de Meteorologia e Geofísica.
Year: 1990

Explanatory Note
Author: J. M. Miranda and L. A. Mendes Victor
Year: 1991

This map was made from the aeromagnetic survey of Mainland Portugal, carried out by the Instituto Nacional de Meteorologia e Geofísica, in collaboration with the Força Aérea Portuguesa and the Centro de Geofísica da Universidade de Lisboa. Geological background simplified by F. Moitinho de Almeida, from the Geological Maps of Portugal 1: 500 000 and 1: 1 000 000.