%0 Journal Article %A BORTFELD, R. %T PRESIDENTIAL ADDRESS %D 1976 %J Geophysical Prospecting, %V 24 %N 3 %P 423-428 %@ 1365-2478 %R https://doi.org/10.1111/j.1365-2478.1976.tb00945.x %I European Association of Geoscientists & Engineers, %X %U https://www.earthdoc.org/content/journals/10.1111/j.1365-2478.1976.tb00945.x