The Murray archive - consisting of 155,00 items - has arrived at its new home in Scotland.
The archive is focused on the 19th century, when the family published the works of many of the greatest figures of the day.
The 155,000 items range from the heavyweight ledgers used to record the business of the firm, to precious letters. Among the most valuable are the Darwin records, including the letter in which he proposed The Origin of Species to his publisher, and the firm's original printed file copy of the work, which is valued at about £100,000.
The Byron material is also enormously valuable and includes the manuscript of Childe Harold and love letters from Lady Caroline Lamb, as well as letters from a mystery love.