dies natalis of Leiden University Meeting room of Leiden Observatory Going-away reception at the University Library: fo… Going-away reception at the University Library: sp… Going-away reception at the University Library: dr… Leiden weer gezellig Roof ornament on the ground in the Hortus Botanicu… A friend of mine received a M. Phil. in one of the… Staircase, Rapenburg 67 The Opening of the Academic Year of Leiden Univers… The Opening of the Academic Year of Leiden Univers… Solving our archive space problem at work: floodin… Academy Building of Leiden University just before… Academy Building of Leiden University just before… Academy Building of Leiden University just before… Academy Building of Leiden University just before… Academy Building of Leiden University just before… Six-pack angel with hourglass View from a window of the Gravensteen in Leiden, t… View from a window of the Gravensteen in Leiden, t… At work: discovering the terrible truth of the new… View from a window of the Gravensteen in Leiden, t… Edward O. Wilson delivering the Tinbergen Lecture… A friend of mine received his master's degree toda… Student almanacs A friend of mine writes his name on the wall of th… Hockeyjongens The Opening of the Academic Year Wood from the Academy Building in Leiden Ode to the Stationsweg-46 building Ode to the Stationsweg-46 building Ode to the Stationsweg-46 building Student boys I went to a saying-goodbye party of a colleague The reception was held at our Botanical Garden The Leiden historical student fraternity "Robert F… The Leiden historical student fraternity "Robert F… The Leiden historical student fraternity "Robert F… The Leiden historical student fraternity "Robert F… The new office Old and new Memorial plaque for Kamerlingh Onnes 433rd dies natalis of Leiden University: professor… 433rd dies natalis of Leiden University: the proce… 433rd dies natalis of Leiden University: former Re…