Pub date for The Last Prince of the Mexican Empire is May 5th. The list of selected books consulted is now on-line. I've added a few links to relevant blog posts and in the coming days will be adding more. Some of these works are now available on-line in their entirety.
Aguilar Ochoa, Arturo, ed., La fotografía durante el Imperio de Maximiliano.
Almonte, Juan Nepomuceno, Guía de forasteros y repertorio de conocimientos útiles.
Arróniz, Marcos, Manual del viajero en México, Paris: 1858.
Ávila, Lorenzo, ed., Testimonios artísticos de un episodio fugáz 1864-1867.
Basch, Dr. S., (translated by Hugh McAden Oechler), Memories of Mexico: A History of the Last Ten Months of the Empire.
Bigelow, John, Reminiscences of an Active Life. 3 volumes.
Blanchot, Col. Charles, Mémoires: L'Intervention Française au Mexique. 3 volumes.
Blasio, José Luis, Maximiliano íntimo: El Emperador Maximiliano y su corte.
Buffum, E. Gould, Sights and Sensations in France, Germany, and Switzerland; or, Experiences of an American Journalist in Europe.
Clay, Mrs., A Belle of the Fifties: Memoirs of Mrs Clay, of Alabama, Covering Social and Political Life in Washington and the South, 1853-66.
Conte Corti, Egon César, Maximiliano y Carlota.
Cortina del Valle, Elena, ed., De Miramar a México.
Evans, Henry Ridgely, Old Georgetown on the Potomac.
Evans, Dr. Thomas W., The Second French Empire: Napoleon the Third; The Empress Eugénie; The Prince Imperial.
Fabiani, Rossella, Miramare Castle: The Historic Museum.
Gooch, Fanny Chambers, Face to Face With the Mexicans. Original, unedited edition.
Hamann, Brigitte, Con Maximiliano en México: Del diario del príncipe Carl Khevenhüller, 1864-1867.
Haslip, Joan, The Crown of Mexico.
Kearny de Iturbide, Louise, My Story. Manuscript, Catholic University Archives.
Iturriaga de la Fuente, José N., Escritos mexicanos de Carlota de Bélgica.
Kolonitz, Paula, Un viaje a México en 1864. Translated by Neftali Beltrán.
Leech, Margaret, Reveille in Washington, 1860-1865.
Lombardo de Miramón, Concepción, Memorias.
Luca de Tena, Ciudad de México en tiempos de Maximiliano.
Magruder, Henry R., Sketches of the Last Year of the Mexican Empire.
Mann-Kenney, Louise, Rosedale: The Eighteenth Century Country Estate of General Uriah Forrest, Cleveland Park, Washington DC.
Maximilian, Emperor of Mexico, Recollections of My Life. 3 volumes.
Michael, Prince of Greece, The Empress of Farewells: The Story of Charlotte, Empress of Mexico.
Meyer, Jean, ed., Yo, el francés: Biografías y crónicas.
Ortiz, Orlando, Diré adiós a los señores: Vida cotidiana en la época de Maximiliano y Carlota.
Pani, Erika, El Segundo Imperio.
Payno, Manuel, The Bandits from Río Frío. Translated by Alan Fluckey.
Ratz, Konrad, Tras las huellas de un desconocido.
Ratz, Konrad, Correspondencia inédita entre Maximiliano y Carlota.
Reglamento y ceremonial de la Corte, 1866. Second Edition.
Ridley, Jasper, Maximilian and Juárez.
Romero de Terreros, Manuel, La corte de Maximiliano: Cartas de don Ignacio Algara.
Robertson, William Spence, Iturbide de México.
Ruiz, Ramón Eduardo, ed., An American In Maximilian's Mexico, 1865-1866: The Diaries of William Marshall Anderson.
Salm-Salm, Felix, The Diary of Prince Salm-Salm.
Salm-Salm, Princess (Agnes), Ten Years of My Life.
Solares Robles, Laura, La obra política de Manuel Gómez Pedraza.
Stevenson, Sara Yorke, Maximilian in Mexico: A Woman's Reminiscences of the French Intervention 1862-1867.
Villalpando, José Manuel, Maximiliano.
Warner, William W., At Peace with All Their Neighbors: Catholics and Catholicism in the National Capital, 1787-1860.
Windle, Mary J., Life in Washington.