The Correspondence of Madame, Princess Palatine, Mother of the Regent; of Marie-Adélaïde de Savoie, Duchesse de Bourgogne; and of Madame de Maintenon, in Relation to Saint-Cyr by Orléans, Charlotte-Elisabeth, duchesse d' Wormeley, Katharine Prescott Sainte-Beuve, Charles Augustin Maintenon, Madame de Marie Adelaide, of Savoy, Duchess of Burgundy
 is a Project Gutenberg book, now on Github.