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Goodmorning Herr Röntgen
Bouke Ylstra, 1973, drawing, RP-T-2010-43-846
The birdwatchers
Bouke Ylstra, 1973, drawing, RP-T-2010-43-844
Xenopsylla Cheopsis The Birdwatch
Bouke Ylstra, 1973, drawing, RP-T-2010-43-843
De neushoornkever
Bouke Ylstra, 1973, drawing, RP-T-2010-43-845
Man en vrouw
Bouke Ylstra, 1958, drawing, RP-T-2010-43-879