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Bert (A.H.) Roos: Hommelnest in nestkast
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Bert (A.H.) Roos: Steenuil - 1
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Bert (A.H.) Roos: Steenuil juveniel - 1
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Bert (A.H.) Roos: Steenuil - 2
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Bert (A.H.) Roos: Steenuil - 3
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Bert (A.H.) Roos: Steenuil juveniel - 3
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Bert (A.H.) Roos: Mistige morgen op de heide