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
--Conferences - Meetings