 Novgorodsko-Sofiysky Svod

According to Russian philologist Aleksey Shakhmatov, Novgorodsko-Sofiysky Svod (, Novgorod-Sofia Compilation) is a tentative name for a hypothetical common source for the Novgorod Fourth Chronicle and the Sofia First Chronicle.Shakhmatov initially dated it by 1448 (hence it also used to be called 1448 compilation; ), but later revised his opinion to 1430s.