A brief summary in Italian of Gaetano Donizetti's opera Anna Bolena can be found at http://www.novanet.it/bianchini/donizetti/id27.html
A plot summary in English can be found at http://www.johnrpierce.com/abpsone.html
A very brief summary in English can be found at http://www.tardis.ed.ac.uk/~type40/callas/anna.htm
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DVD
Recordings
Anna Bolena recordings at gemm.com
Donizetti: Anna Bolena / Gavazzeni, Callas, Simionato, Raimondi, Opera d'Oro, arkivmusic.com
Anna Bolena (Donizetti): Gesamtaufnahme (ital.)
Lion.cc