chemical analyses of rocks and minerals - spectrochemical work - summary Jaarverslagens of geological and mineralogical investigations Annual Jaarverslagen (1958-59)

chemical analyses of rocks and minerals - spectrochemical work - summary Jaarverslagens of geological and mineralogical investigations Annual Jaarverslagen (1958-59) - International Geological Congress - Jaarverslagen of the Twenty-Third Session Czechoslovakia 1968 .

--Conferences - Meetings