The collection includes correspondence, manuscripts, documents, photographs, subject files and printed materials. Correspondence consists mostly of letters to Elizaveta Miller. Memoirs and manuscripts are mostly by Miller and cover topics ranging from her childhood in St. Petersburg to her emigration to South Africa. Subject files include materials concerning her brother, Grigoriĭ Lozinskiĭ, a poet, translator and literary critic. Documents and photographs concern the Lozinskiĭ and Miller families. Printed materials consist of books, clippings, periodicals, and pamphlets; included is an "Almanach de St. Petersburg" (1911), with directories and a listing of names.

The papers consist of correspondence, manuscripts, photographs, a subject file, and printed materials. The correspondence includes a letter from Randall Thomas Davidson, Archbishop of Canterbury, and one from Nikolaĭ Roerich. There is an essay about Metropolitan Platon by I︠O︡ann Chepelev, and a number of photographs depicting church officials and White army leaders. There is a subject file concerning Platon's meeting in 1919 with President Wilson. The collection also contains articles and clippings by and about the Metropolitan, and there are several books and pamphlets as well. The materials were collected by his daughter and grandson; many of the items are photocopies.