Baykal
Village in Pleven Province, Bulgaria
Royal Botanic Gardens Kew
Naturalis Biodiversity Center
Naturalis Biodiversity Center
The Trustees of the Natural History Museum, London
Natural History Museum in Paris
Karastoyanov, Boncho
Public Library Pencho Slaveykov, Varna
Public Library Pencho Slaveykov, Varna
Royal Botanic Gardens Kew
Naturalis Biodiversity Center
Naturalis Biodiversity Center