Waldburg Papers. Vols. cxii a-p. Correspondence between Frederika and her sister Ellen Marvin; 1947-1980. Partly copies, typewritten, drafts, German. See also Add. 73026.
Waldburg Papers. Vols. cxxii, cxxiii. Correspondence and papers of Delbruck Schickler, stockbrokers, concerning shares and other financial matters; 1932-1971, n.d. See also Add. 73063. Two volumes.
Waldburg Papers. Vols. cxxiv-cxxvii. Correspondence and papers of Alfred Stockmann and Co., estate agents and property managers; 1943-1971. See also Add. 73036-73038 and Add. 73041, art. 1. Four volumes.
Waldburg Papers. Vols. cxxviii-cxxx. Correspondence and papers of Allgauer Treuhand, chartered accountants, relating to taxes, properties and other financial business; 1949-1979. See also Add. 73032-73035, Add. 73039, Add. 73044, art. 1. Three volumes.
Waldburg Papers. Vols. cxxxi, cxxxii. Correspondence and papers of Berliner Aktiengesellschaft für Industriebeteiligungen, mainly between Dr. Elly Bock and Frederika; 1949-1979. See also Add. 73032-73038. Two volumes.
Waldburg Papers. Vols. cxxxiv, cxxxv. Correspondence and papers of Dr Nath, lawyer, mostly relating to property; 1957-1960. See also Add. 73038. Two volumes.
Waldburg Papers. Vols. cxl, cxli. Correspondence and papers involving Frederika and various lawyers, bankers, estate agents etc., regarding the finance and administration of the Waldburg estate. Includes inventories, a deed of sale and a court action. Most relates to the sale of Berg Villa. See also Add. 73042, 73043, Add. 73050-73052. Two volumes.
Waldburg Papers. Vols. cxlii, cxliii. General correspondence and papers relating to mortgages, house sales, lettings, banking etc., involving various lawyers, banks, estate agents; 1929-1959. Two volumes.