Political themes were again reflected in Nicolae Iorga's 1915 report to the Academy ("Dreptul la viață al statelor mici", "The Small States' Right to Exist") and in various of the 37 books he published that year: "Istoria românilor din Ardeal și Ungaria" ("The History of the Romanians in Transylvania and Hungary"), "Politica austriacă față de Serbia" ("The Austrian Policy on Serbia") etc. Also in 1915, Iorga completed his economic history treatise, "Istoria comerțului la români" ("The History of Commerce among the Romanians"), as well as a volume on literary history and Romanian philosophy, "Faze sufletești și cărți reprezentative la români" ("Spiritual Phases and Relevant Books of the Romanians"). Before spring 1916, he was commuting between Bucharest and Iași, substituting the ailing Xenopol at Iași University. He also gave a final touch to the collection "Studii și documente" ("Studies and Documents"), comprising his commentary on 30,000 individual documents and spread over 31 tomes.