Once on the book page, look for a list of file formats. Choose FB2 .
"Mitridat" is a massive historical epic set in the Bosporan Kingdom. It is often split into two or three volumes depending on the edition: "The Great King" (Великий царь) polupudnev mitridat skachat fb2
The most comprehensive source. You can usually find the complete "Mitridat" collection here. Search for "Степан Полупуднев" and look for the FB2 download link next to the title. Once on the book page, look for a list of file formats