The British Library keeps most of Handel's manuscripts and
has vast holdings of Handelian research materials and literature.
Handel's autgographs available online here.
The Gerald Coke Handel Collection, housed at the Foundling Museum, is a fantastic library
containing manuscripts, librettos, early printed editions, pictures, documents, literature and recordings.
Some items available online via the online catalogue.
The Fiztwilliam Museum, Cambridge, has an important collection of Handel manuscripts.
Catalogue only online.
The special music collections at Hamburg Staats- und Universitätsbibliothek
contain almost all of Handel's so-called 'conducting' scores.
Some of the scores are available online here
Online catalogue of RISM manuscript musical sources.
Friedrich Chrysander (editor): G.F. Händels Werke: Ausgabe der Deutschen Händelgesellschaft
The old nineteenth-century edition of Handel's complete works is freely available at IMSLP
and is still useful as a study guide, but for more correct critical editions please see the HHA
Handel Librettos
Typescripts of numerous Handel works, mostly English-language oratorios, odes and dramas,
input by Pierre Degott.
Handel Wordbooks
Online repository of Ellen T. Harris (ed.) The Librettos of Handel's Operas
Handel Reference Database
Database and list of links devoted to historical documents connected to Handel
maintained by Dr. Ilias
Chrissochoidis.
Handel Opera Performances Since 1705
Database of all performances of Handel's music dramas in staged productions or concert performances since 1705 (including concert performances of operas but not including oratorio concerts) developed from research by Manfred Rätzer and provided by the Händel-Haus Museum, Halle.
Burney Collection of Newspapers
A searchable digitised database of the British Library's Burney Collection
of 17th and 18th Century Newspapers.
Subscription required.
Eighteenth Century Collections Online (ECCO)
A digitised collection
of 18th century books in English
including many wordbooks of operas and oratorios.
Subscription required.
Eighteenth Century Journals (ECJ)
A digitised collection
of 18th century journals in English
Subscription required.