These consist of General Letter Books, 1668 to 1836; Finance Room Letter Book, 1856 to 1866; General Letter Books, First Department, 1835 to 1849; General Letter Books, Third Department, 1832 to 1849; General Letter Books, Miscellaneous, 1836 to 1849; General Letter Books, First Division, 1849 to 1856; General Letter Books, Second Division, 1849 to 1856; General Letter Book, Third Division, 1855 to 1856, and General Letter Books, Miscellaneous, New Series, 1857 to 1920, being a continuation of the three preceding series.