Mexico covers, 19th & 20th, accumulation of 665 covers, incl. Air Post, flights, censored, Juarez issues, Maderos, revolutionary issues, maritime, many better cancels present incl. Ozumba, La Barca, Azcapotzalco, Jalapa, Monclova, Tacubaya, Charcas and others, some have faults, mostly fine-very fine lot