"Vault" is the first commented edition in world science of all sources related or traditionally attributed to the ancient Slavs. The second (final) volume is built on the same principles as the first, published in 1991 and reprinted in 1994: the original texts are given in parallel with new Russian translations. Each source (cited in excerpts) is preceded by an introduction containing information about the author, the features of the source, about handwritten tradition, etc.