All are in the public domain due to age. Many can be found in various places around the internet but I found them here: https://tatasoz.livejournal.com/2657941.html. Where you can also see some of his lovely building images.
Jewels of the heart that dance right in . . . wondrous designs by Russian artist Viktor Alexandrovich Hartmann 1834-1873). Perished at a tragically young age so this is (almost) all there is and there isn’t any more.
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