Earth and Man Museum, Sofia; see also here  
Mineral Collection of the Central Laboratory of Mineralogy and Crystallography, Bulgarian Academy of Sciences, Sofia
Museum of Geology & Paleontology, University of Mining & Geology St. Ivan Rilski, Sofia
Museum of Mineralogy, Petrography and Mineral Deposits, University of Mining & Geology St. Ivan Rilski, Sofia
Museum of Paleontology & Historic Geology, Sofia University St. Kliment Ohridski
Natural History Museum, Pleven
Natural History Museum, Varna (site in Bulgarian)