May 1 (April 18), 1917 On the Isakievskaya Square. Petrograd [Izomaterial: electronic resource]: [postcard]. - Electronic data (2 files: 1.6 MB). - (St. Petersburg: Presidential Library, 2017). - Access mode: the Internet portal of the Presidential Library. The title from the screen. Electronic reproduction of the postcard: on May 1 (April 18), 1917 On Isakievskaya Square. Petrograd [Izomaterial]. [Petrograd, 1917]. 1 postcard: offset. Location: From a private collection. Copying by users is not allowed.
I. Presidential Library (St. Petersburg) .1. "St. Isaac's Cathedral", the State Museum-monument (St. Petersburg, city) - Postcards. 2. Postcards in the Presidential Library fund (collection). 3. The people (the collection). 4. Power (collection). 5. 1917: February-October (collection). 6. Territory of Russia: St. Petersburg, city (collection). 7. The first of May - History - St. Petersburg, the city - Postcards. 8. St. Isaac's Square (St. Petersburg, city) - Postcards. 9. Documentary cards - Russia - 1909-1917.
BBC 63.3 (2) 535 -611 BBK 63.3 (2-2SPB) 535y611
Source of the electronic copy: Children's postcard museum Original storage: From private collection