Perhaps you should try some spelling variations:
"quellen und dokumente about michelangelo buonarroti / e-texts" » "quellen und dokumente zu michelangelo buonarroti / e-texts" (Expand Search)
"quellen und dokumente di michelangelo buonarroti / e-texts" » "quellen und dokumente _ michelangelo buonarroti / e-texts" (Expand Search), "quellen und dokumente zu michelangelo buonarroti / e-texts" (Expand Search), "quellen und dokumente di michelagnolo buonarroti / e-texts" (Expand Search)

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