Isaak Dunayevsky'
...that an unknown manuscript of opera libretto by writer Mikhail Bulgakov was found in Isaak Dunayevsky's archive after his death in 1955?
...that an unknown manuscript of <a href="./Opera" id="mwCFo" rel="mw:WikiLink" title="Opera">opera</a> <a href="./Libretto" id="mwCFs" rel="mw:WikiLink" title="Libretto">libretto</a> by writer <a href="./Mikhail_Bulgakov" id="mwCFw" rel="mw:WikiLink" title="Mikhail Bulgakov">Mikhail Bulgakov</a> was found in <b id="mwCF0"><a href="./Isaak_Dunayevsky" id="mwCF4" rel="mw:WikiLink" title="Isaak Dunayevsky">Isaak Dunayevsky</a>'</b>s archive after his death in <a href="./1955" id="mwCF8" rel="mw:WikiLink" title="1955">1955</a>?