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XVII Convegno Chitarristico, Modena, Sala San Vincenzo, 1-2 ottobre 1955 (Biblioteca civica d'arte Poletti, Fondo Tonini, Modena)
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Heinz Bischoff (Biblioteca civica d'arte Poletti, Fondo Tonini, Modena)
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Heinz Bischoff (arch. priv. Zeri, Cremona)
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Heinz Bischoff (arch. priv. Zeri, Cremona)
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