Bulgaria natural heritage
1995
Spiridonov, Jeko |
Bulgaria
Danube integrated environmental study : preliminary study on the pollution of the Danube river and its tributaries in Bulgaria (Phase 1)
1993
Varlev, Ivan |
Tzankov, Nikolai |
Ivanova, Stella |
New horizons : possibilities for cooperation between environmental NGOs and governments in Central and Eastern Europe
1993
Hardi, Peter |
Juras, Alexander |
Nagy, Magda Tóth |
Chervena kniga ha NR Blgariya v dva toma
Dakov, Mako |
History of the distribution of the lynx in Europe
1968
Kratochvil, Josef |