Manuscripts from Askew's collection of can often be recognised by his characteristic binding, in diced polished calf, with a gilt roll tool of alternating palmettes and fleurs-de-lis motifs:
The collection was sold by G. Leigh & J. Sotheby, London, 7 March, 1785. Those with bindings as above are described as 'corio russico' in the 1785 sale catalogue. Lots 1-312 are printed books, and the manuscripts are arranged by language and material:
A considerable number of the manuscripts are from the collection of Mario Maffei (not just only described as 'olim Maffeianus' in the catalogue).