Collection consists of correspondence, manuscripts, diaries, and printed materials. There are letters and telegrams from Field Marshal Carl Gustaf Emil Mannerheim of Finland; two brief memoirs, one by E.L. Miller about Freederichsz and his wife, the other by the wife, entitled"Le salon de ma tante, la Baronne de Witte;" Freedericksz's diaries from 1938-40; and newspaper clippings about Mannerheim.

Correspondence, manuscripts, documents, photographs, subject files and printed material of Russian émigré writer, journalist, and Kadet Party leader Ariadna Vladimirovna Tyrkova-Williams. The collection also contains material by her husband, Harold Williams, and her son, Arkadiĭ Borman.