from the first one issued in 1880. For preservation reasons the phone books are generally accessed on microfilm, and the phone books 1880-1984 are digitised and have been made available online. BT Archives cares for more than 500,000 images and 1,000 film titles. Selected images can be found on BT Archives online image gallery. Location and access BT Archives is based in Holborn Telephone Exchange in the Holborn area of central London and is open, by appointment, to public researchers on Mondays and Tuesday from 10:00am – 4:00pm. There is no access charge. Holborn was the first public automatic exchange in London in 1927, see Director telephone system. Descriptions of the historic collections are available on the BT Archives online catalogue. Full access, acquisition and preservation policies can be found on the BT Archives website Partnerships and governance It is a partner in the Connected Earth network, the heritage initiative founded by BT in 2001 to safeguard telecommunications artefacts. BT Archives and Connected Earth together form BT Heritage, part of BT's corporate responsibility programme. See also BT Museum External links BT Archives official site BT Archives online catalogue BT Archives online image gallery BT's heritage policy Connected Earth website Searchable records from BT Archives phone books Distant Writing - The History of the Telegraph Companies in Britain between 1838 and 1868 Archives in the London Borough of Camden BT Group Business and industry archives History of telecommunications in the United Kingdom Online archives of the United Kingdom Organisations based in the London Borough of Camden Photo archives in the United Kingdom