Althorp Papers. Vol. mmccclix. 1. Letters to Lady Augusta Seymour from family and friends; 1848-1880, n.d. 2. Miscellaneous letters, mostly by, or relating to, members of Charlotte's family; 1856-1897, n.d.
Althorp Papers. Vol. mmccclxviii. Letters to Lady Spencer from her half sister Mary, Lady Biddulph; 1852-1902. For further papers relating to Mary Biddulph see below.
Althorp Papers. Vol. mmccclxxvi. Letters to Lady Spencer from her brother in law Charles Robert Spencer, afterwards 6th Earl Spencer; 1881-1902. For further correspondence relating to him, see below.
Althorp Papers. Vol. mmccclxxvii. Letters to Lady Spencer from: 1. Her sister in law Victoria, Lady Sandhurst, nee Spencer. Includes a couple of letters by Charlotte from 1870; 1881-1902. 2. Lord Sandhurst; 1882-1902, n.d.
Althorp Papers. Vol. mmccclxxviii. Letters to Lady Spencer from John Evelyn Denison, Viscount Ossington, Speaker of the House of Commons; 1857-1870, n.d.