Distribution map of Abies borisii-regis (Bulgarian Fir).
     Native continuous range
✖ Native isolated population
Caudullo, G., Welk, E., San-Miguel-Ayanz, J., 2017. Chorological maps for the main European woody species. Data in Brief 12, 662-666. DOI: 10.1016/j.dib.2017.05.007
Data: https://doi.org/10.6084/m9.figshare.5100295 
References:

Alizoti, P. G., Fady, B., Prada, M. A., Vendramin, G. G., 2011. EUFORGEN technical guidelines for genetic conservation and use of Mediterranean firs (Abies spp.). Bioversity International, Rome, Italy.
Biserkov, V., Gussev, C., Popov, V., Hibaum, G., Roussakova, V., Pandurski, I., Uzunov, Y., Dimitrov, M., Tzonev, R., Tsoneva, S. (Eds.), 2011. Red Data Book of the Republic of Bulgaria Volume 3: Natural habitats. Institute of Biodiversity and Ecosystem Research &amp; Bulgarian Ministry of Environment and Water, Sofia, Bulgaria.
European Information System on Forest Genetic Resources. EUFGIS database. (Accessed in September 2016)
Farjon, A., 2016. Conifer of the world. Online Database, Department of Plant Sciences, University of Oxford. Accessed in September 2016.
Strid, A., Tan, K. (eds.), 1997. Flora Hellenica, vol I. Koeltz Scientific Books, Königstein. ISBN 9783874293914
Zeneli, G., Dida, M., Ducci, F., Habili, D., 2004. Silver fir (Abies alba) resources in Albania and their conservation. Forest Genetic Resources 31, 44-49.
Giovanni Caudullo