Notes:
v. 22, no. 3, 1968, p. 4-7, 24; v. 22, no. 4, 1968, p. 23-31; v. 22, no. 5, 1968, p. 24-31; v. 22, no. 6, 1968, p. 24-31; v. 22, no. 7, 1968, p. 24-31; v. 22, no. 8, 1968, p. 24-31; v. 22, no. 10, 1968, p. 25-30; v. 23, no. 1, 1969, p. 24-31; v. 23, no. 2, 1969, p. 24-31; v. 23, no. 3, 1969, p. 24-31. Note: Chapter "Numerous marvellous features of railway mail service" reprinted in R.P.O. newsletter, v. 15, no. 5, 1987, p. 2-8. Publié aussi en français sous le titre «Le graphique postal» et «Historique de la poste» dans Cachet postal, v. 22, no 3, 1968, p. 4-7; v. 22, no 4, 1968, p. 23-31; v. 22, no 5, 1968, p. 24-27; v. 22, no 6, 1968, p. 24-31; v. 22, no 7, 1968, p. 24-31; v. 22, no 8, 1968, p. 24-31; v. 22, no 10, 1968, p. 25-30; v. 23, no 1, 1969, p. 24-31; v. 23, no 2, 1969, p. 24-31; v. 23, no 3, 1969, p. 24-27. Réimprimé en français "Le graphique postal" dans Société d'histoire postale du Québec. Bulletin no 21, 1986, p. 282-290. Note: See also reference no. 132 / Voir aussi référence no 132.