In 1952, Stalin's last book, "Economic Problems of Socialism in the USSR", was published. It sought to provide a guide to leading the country after his death. In October 1952, Stalin gave an hour and a half speech at the Central Committee plenum. There, he emphasised what he regarded as leadership qualities necessary in the future and highlighted the weaknesses of various potential successors, particularly Molotov and Mikoyan. In 1952, he also eliminated the Politburo and replaced it with a larger version which he called the Presidium.