Etymology
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Harleian (adj.)
1744, from Latinized form of surname of Robert Harley, Earl of Oxford (1661-1724) and his son Edward, in reference to the library of several thousand books and MSS they collected and sold in 1753 to the British Museum.
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Ambrose 
masc. proper name, from Latin Ambrosius, from Greek ambrosios "immortal, belonging to the immortals" (see ambrosia). The Ambrosian Library in Milan, founded 1609 by Cardinal Borromeo, is named for Saint Ambrose (obit 397), bishop of Milan.
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Laurentian 
in reference to granite strata in eastern Canada, 1854 (Sir W.E. Logan and T. Sterry Hunt), named for the Laurentian Mountains (where it is found), which are named for the nearby St. Lawrence River (see Laurence). Hence, Laurasia. The Laurentian library in Florence is named for Lorenzo (Latin Laurentius) de' Medici.
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Cottonian 

c. 1700, "pertaining to or founded by antiquarian Sir Robert Bruce Cotton (1570-1631), especially in reference to the library in the British Museum, named for him. He donated some books to the state and his grandson donated the rest. It was badly damaged in a fire in 1731. The surname represents Old English cotum, plural of cot "cottage."

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