2nd Internship of Willem Bons1st Internship of Jan Dennenbroek2nd Internship of Isaac Lelie3th Internship of Johannes Frederik Kok1st Internship of Jacobus Kurtz2nd Internship of Eliazer Moscou1st Internship of David Barents2nd Internship of Diederich Willem Reuter4th Internship of Barend Scholte1st Internship of Jan Hendrik Sodenkamp2nd Internship of Jan Hendrik Sodenkamp1st Internship of Cornelis W. Burksen1st Internship of Hendrik van den Bosch