[...] The philosophical works of Arrian's "Diatribes of Epictetus" (8 books, of which 4 are preserved) are our only source for the philosophy of Epictetus. From his military works, "The Periplus of the Euxine Sea," "The Art of Tactics," and part of the work "Campaign against the Alans" have been preserved. From his historical works, "The Anabasis of Alexander" and "The Indica," which is a supplement to it, have been preserved. These works demonstrate Arrian's writing ability and have preserved his name throughout the centuries. The remaining historical works ("Bithynica," "Parthica," "Alanica" [i.e. history], "The Events after Alexander") as well as the biographies of Timoleon, Dion, and a certain bandit Tilliborus have been lost. Also preserved is a "Hunting," which complements Xenophon's work of the same name.
(from the introduction of the book)