Bloomsbury has purchased the backlist of The National Archives Publishing programme, and entered into an agreement to co-publish a range of forthcoming titles.
The National Archives of the United Kingdom, in Kew, holds more than 1,000 years of government files from Foreign and Home Office records to colonial and military documents, with more than 80 million digitised records.
The co-branded publishing programme enables Bloomsbury to work with the National Archives' in-house authors and record specialists, as well as its stable of authors.
Bloomsbury Publishing chief executive Nigel Newton said: "The National Archives is one of the world's key repositories of historical documents. We are very excited by the publishing opportunities it represents. We look forward to working closely with The National Archives and to see how we might best bring added value to this extraordinarily valuable material."
Licensing manager at The National Archives, Laura Simpson, said: "This joint venture marks a new direction in The National Archives' approach to publishing. By seeking innovative opportunities to tap into our vast collection of historic resource material we can interest and enthrall a wider audience than ever before.
"Bloomsbury brings significant expertise in both trade and academic publishing and we look forward to working together to uncover mysteries and reveal untold tales from the archives".
The National Archives backlist includes titles such as Genealogists' Internet by Peter Christian and The UFO Files by Dr David Clarke.