Assertion: feather's bird | /r/HasProperty | de beer
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Source sentences:
text: However, the Eichstatt specimen has clear feather impressions (Wellnhofer 1974) and the Maxberg specimen has impressions in which the structure of the feather is discernable as being typical of that in modern birds (de Beer 1954; von Heller 1959; Charig et al. 1986).