The book is a translation from the Slovenian language of the incomplete book by N. A. Mikhailov (1967-2010) "Zgodovina slovanske mitologije v XX. stoletju." H. A. Mikhailov was interested in the theme of primary and secondary ("cabinet mythology") sources of Slavic mythology. The book is addressed to specialists in mythology and Slavic antiquities, as well as to a wide range of readers interested in the traditional spiritual culture of the Slavs.