The Complete Collection of Russian Chronicles (Russian: Полное собрание русских летописей, romanized: Polnoe Sobranie Russkikh Letopisey, abbr. PSRL) is a series of published volumes aimed at collecting all medieval East Slavic chronicles, with various editions published in Imperial Russia, the Soviet Union, and Russian Federation. The project is ongoing and far from finished. The first ten volumes appeared between 1841 and 1863. New volumes have been brought forth piecemeal throughout the 20th and early 21st centuries. Some of the older volumes have also been reprinted, especially after 1997.