Конволют из 3-х номеров журнала "Иртыш, превращающийся в Ипокрену". Ежемесячное сочинение издаваемое от Тобольского Главного Народного Училища. — В типографии у В. Корнильева. — Тобольск: Тобольское главное народное училище, 1791 г. — 60, 62, 54 с. (Дореформ. орф.). July (Июль) 1791. — pp.: Missing title, table of content unpag., verso blank, [1] 2-60. June (Июнь) 1791. — pp.: Title with censor stat. on verso, table of content unpag., verso blank, [1] 2-62. August (Август) 1791. — pp.: Title, table of content unpag., verso blank, [1] 2-54. Bound in this order. "The Irtysh river turning into Hippocrene" was the first monthly magazine in Russian Siberia published in 1789 — 1791 in Tobolsk. It was featuring journalism, commentary, poetry, the fiction of provincial and metropolitan authors, as well as translations of various articles from foreign journals. It was published by Department of Tobolsk Public Education and printed in the establishment of Kornil'ev (Корнильев), a local merchant.  The idea of publication belonged to Pankraty Sumarokov (1765 — 1814), a grandnephew of Alexander Sumarokov, distinguished Russian humanist and homme de lettres of Catherine the Great epoch. Pankraty was also the chief editor of the publication. Initially, the print run was 300 copies; reduced in 1791 to 106 copies only.