Letters
to Jacques Bizet, Daniel Halèvy, Robert Dreyfus, Lucien Daudet From
Écrits de jeunesse, Institut Marcel Proust International, 1991. Explanatory Note: I am well aware that this is a very random selection of letters. That is because of the way my website developed over the years. To begin with, in the early days of the internet and with limited material available to me, I simply used whatever I came across. Later on I began to deliberately concentrate on Proust's articles, manuscripts and variants, only occasionally adding a few letters. A systematic translation of all the correspondence would take another lifetime.
Letters
to Jacques Bizet, Daniel Halèvy, Robert Dreyfus, Lucien Daudet From
Écrits de jeunesse, Institut Marcel Proust International, 1991.
Letter
to his grandfather Requesting money to cover his expenses at a
brothel. From lettersofnote.com
Letters
to Mme and M. d'Eyragues From Marcel Proust et les Eyragues.
Deux lettres inédites. e-dite, 2002.
Visiting
Card sent to Saint-Saëns Château-Musée de Dieppe.
Letters
to Mme de Noailles From Correspondance Générale vol 2 Lettres à
la Comtesse de Noailles, Plon 1931. Translations of letters not
included in Selected Letters series or Letters of Marcel
Proust, Mina Curtiss. Letter numbers are from Plon, notes by Anna
de Noailles. Some additional text from Correpondance de Marcel Proust.
Letters
to Mme Straus From Correspondance Générale Correspondance avec
Madame Straus, Plon 1936. Translations of letters not included in Selected
Letters series or Letters of Marcel Proust, Mina Curtiss.
Letter numbers and notes are from Plon.
Letters
to M. Émile Straus From Correspondance Générale Correspondance
avec Madame Straus, Plon 1936. Translations of letters not included
in Selected Letters series or Letters of Marcel Proust,
Mina Curtiss. Letter numbers and notes are from Plon.
Letters
to the de Caillavets, R. de Flers & B. de Fenelon From Quelques
Lettres de Marcel Proust à Jeanne, Simone, Gaston de Caillavet, Robert
de Flers, Bertrand de Fenelon, Librairie Hachette 1928.
Translations of letters not included in Selected Letters series
or Letters of Marcel Proust, Mina Curtiss.
Letter
to Francis Planté Letter to Francis Planté (1839-1934), French
pianist. From Revue de musicologie, 95/I, 2009, Une lettre inédite de
Marcel Proust à Francis Planté.
Letter
to Antoine Bibesco From the Kolb Proust Archive For Research.
Letters
to Reynaldo Hahn A few letters from Lettres de Marcel Proust à
Reynaldo Hahn, Gallimard 1956, but taking any suppressed material
from Correspondance.
Letters
to Léon Yeatman From the Kolb-Proust archive.
Unpublished
letter to Léon Bélugou From Musée des lettres et manuscrits
Unpublished
letter to unknown recipient Possibly Georges-Raphaël Lévy.
Letter
to Louis d'Albufera Including a draft letter to Le Figaro on
d'Albufera's behalf about the telephone scandal, c.30 March 1907. From Bulletin
d'informations proustiennes, 51. 
Letter
to a journalist Response to an inquiry about a favorite poet. From Du
temps perdu au temps retrouvé, Musée des lettres et manuscrits,
2010.
Letter
to Daniel Halévy Letter of condolence on the death of Halévy's son
and comments on H.G. Wells.
Telegram
to Odilon Albaret From auction catalogues.
Letter
to Albert Le Cuziat The only known letter to Le Cuziat. From
Proustonomics.
Telegrams
to Céleste Albaret From auction catalogues.
Letters
to Mme Fournier Mme Fournier was Robert Proust's long-standing
mistress; Marcel acted as go-between during the war. From Bulletin
d'informations proustiennes, 41.
Letter
to Romain Rolland From Marcel Proust Aujourd'hui no 5.
Unpublished
letter to Jacques Truelle(?) From Musée des lettres et manuscrits
Unpublished
letter to a friend From Musée des lettres et manuscrits
Letter
to unidentified friend From auction catalogue.
Letter
to Gustave Kahn Letter to the poet and literary critic about
Proust's preface to Propos de peintre.
Letters to Jean Gustave Tronche Letters to the administrative
director of La Nouvelle Revue Française.
Letter to Jean de Pierrefeu Long letter in response to an
unfavorable review. Revue d'Histoire Littéraire de la France,
1971.
Unpublished
letter to Henri Duvernois From Musée des lettres et manuscrits
Telegram
to Jacques Rivière From auction catalogues.
Letter
to Jean Folie-Desjardin From auction catalogues.
Extracts from Miscellaneous Letters Taken from various sales
catalogues etc (some unpublished ?).
Draft
reply to André Lang Response to the enquiry "Y a-t-il encore les
écoles littéraires?"
Le
renouvellement du style Response to the enquiry "Sommes-nous en
présence d'un renouvellement du style?" was published in La
Renaisance, politique, littéraire, artistique 22 July 1922 and
reprinted in Essais et articles, Gallimard 1971.
Une
Tribune Française au Louvre? Response to a question posed by L'Opinion,
published 28 February 1920 and reprinted in Essais et articles,
Gallimard 1971.
Draft
reply to L'Intransigeant Response to a question posed by L'Intransigeant,
August 1920. From Marcel Prousts Fragebogen.
Letters
to the Prince of Monaco Previously unpublished letters from Annales
Monégasques, no 39, Publication des archives du Palais Princier,
2015.
Letters
from WW1 Letters published online in Corr-Proust.