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It is always worth finding out if the archive you intend to visit has its own online catalogue accessed via its website. If you have located an archive using the ARCHON database, this should have provided you with their website address. Most of the national archives have separate online catalogues containing descriptions of documents not found on A2A or the NRA.

• The National Archives’ Catalogue has descriptions of an impressive 10 million documents that you can search by keyword, date range or government departmental code from www.nationalarchives.gov.uk/catalogue. The documents held at TNA are categorized according to the government department they originated from, and a departmental code forms the first part of any TNA document reference. For example, WO is the prefix of all document references for records from the War Office. Searching for document descriptions by government departmental code can help to narrow down the number of results you get if you know what type of record you are looking for.

• The National Archives of Scotland has a database known as OPAC (Online Public Access Catalogue) that can be found at www.nas.gov.uk/catalogues/default.asp. This searches their collections by keyword, place authority, name authority and date, and the NAS website has a list of documents that have not yet been uploaded to OPAC and require a search of the original indexes. You could also consult the National Register of Archives for Scotland (NRAS), which is only available in paper form at the National Archives of Scotland and the National Library of Scotland. This is a survey of papers held by private archives in Scotland.