Althorp Papers. Vols. dclxvii, dclxviii. Letters from William Marsden (1754-1836), F. R. S., secretary of civil department and secretary at the Admiralty; 1801-1834. Two volumes.
Althorp Papers. Vols. dcclxii-dcccliii. General correspondence, chronologically arranged; 1766-1834. The names of the writers of letters are included in a card index in the Reading Room. The dates of the letters given there, rather than the old reference numbers, should used as a guide to their place in the sequence below. Ninety-two volumes.
Althorp Papers. Vol. mmliv-mmlxiii. Papers, including printed drafts of bills, concerning domestic legislation and policies; 1874-1895. Mostly printed. Ten volumes.
Althorp Papers. Vols. mmccclxxxiv-mmcdxi. General correspondence, being mainly letters addressed to Lady Spencer.; 1851-1903. Partly French, Italian. Including some papers relating to her charity work, partly printed and typewritten. Twenty eight volumes.