Oktoikh
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Ohtoikh is an incunabula Psalter, the first printed book in Cyrillic script. It was printed by Schweipolt Fiol in Cracow in 1491.
The only complete copy of Oktoikh is kept by the Rossiiskaya Gosudarstvennaya Biblioteka (Russian State library, Moscow). In the past the copy belonged to Johann Hess, a Wroclaw bibliophile.
