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De neushoornkever
Bouke Ylstra, 1973
Xenopsylla Cheopsis The Birdwatch
Bouke Ylstra, 1973
We've met miss Jones
Bouke Ylstra, c. 1953 - in or before 1970
Goodmorning Herr Röntgen
Bouke Ylstra, 1973
The birdwatchers
Bouke Ylstra, 1973
Man en vrouw
Bouke Ylstra, 1958
Compositie
Bouke Ylstra, c. 1959 - in or before 1962
Planten-vogels
Bouke Ylstra, 1960
Spelende kinderen
Bouke Ylstra, c. 1950 - in or before 1964
Oost-Berlijn
Bouke Ylstra, 1963
Planten, vogel en man
Bouke Ylstra, 1960