This work is in the public domain in its country of origin and other countries and areas where the
copyright term is the author's life plus 80 years or fewer.
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
Also published in: Nikola Stanev (d. 1949): "Istoria na turnovskata predbalkanska kotlovina", Veliko Turnovo, Bulgaria 1942, where it is described as a drawing by Felix Kanitz (1829 - 1904) from 1876
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