/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: MarinusHNederlof https://cdn.slidesharecdn.com/profile-photo-MarinusHNederlof-48x48.jpg?cb=1553356597 I have a doctorate in geology from Leiden University (1959) and worked for 31 years for Shell International in various function. Since 1990 I am a consultant for Oil and Gas Companies world-wide. My website is www.mhnederlof.nl