Subjects: Twardowski; Source: IFiS PAN, call no. T'R.177-T.21,42 ; http://ifis.katalog.pan.pl/ipac20/ipac.jsp?profile=fis&index=BOCLC&term=kj_123802 ; IFiS PAN, sygn. T'R.177-T.21,42
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