En
Ru| Title | The case of the invention by the music teacher of the Astrakhan gymnasium I. Dobrovolsky method of printing notes on the stone and paper musical pipes that replace copper, and the submission of the Litographic Quartet, compiled by Dobrovolsky |
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| Series | General Affairs of the 1st Department of the Department of Public Education for the years 1818-1840. |
| Fonds | Department of Education of the Ministry of Education |
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