The Greater Manchester County Record Office (GMCRO) is an archive of primary materials relating to the heritage of Greater Manchester, in North West England; it is located in Manchester city centre, in Archives + in Manchester's Central Library. Opened in 1976, the main function of the GMCRO is to store historical records relating to the Greater Manchester, and to make them available for members of the public for research. There are 4 miles (6 km) of shelving of records, which date back to 1197.

More information on the Wikipedia page [1].

The website is [2].