The manuscript collection of more than 7,000 volumes; more than 14,000 original legal documents; and more than 500 rolls.[clarification needed] It was formed by Robert Harley (1661–1724) and his son Edward (1689-1741). In 1753, it was purchased for £10,000 by the British government and—together with the collections of R.B. Cotton and Hans Sloane—formed the basis of the British Museum's library, which became the British Library in 1973.
- Lacnunga (Harley 585)
- Inventory of Henry VIII of England (Harley 1419)
- Minuscule 113 (Harley 1810)
- Harley Lyrics (Harley 2253)
- Harley Golden Gospels (Harley 2788)
- Book of Nunnaminster (Harley 2965)
- Minuscule 3686
- Harleian Genealogies (Harley 3859)
- Minuscule 104 (Harley 5537)
- Minuscule 505 (Harley 5538)
- Ptolemy's Geography (Harley 7182 & 7195)
- Harley MS. 7334
- Harleian prayerbook (Harley 7653)
- British Library. "History of the Harley Library".
- British Library Journal vol. 15 (1989) is devoted to Robert Harley and his collections.
- C. E. and C. R. Wright, eds. The Diary of Humfrey Wanley 1715–1726, 2 vols (London, 1966).
- The foundation collections at the Catalogue of Illuminated manuscripts
- List of medicine and alchemist manuscripts PDF, 192 KB
- Trilinguical Psalter
- Harley Bestiary (Harley 4751)
- The Book of Nunnaminster (Harley 2965)