BulgariaDirectory.com contains listings to browse for any aspects such as business, society, travel, health, real estate, culture, education, finance, shopping throughout Bulgaria.
2. Bulgarian Ship Hydrodynamics Centre Conducts research in ship and offshore hydrodynamics, coastal hydraulics, aerodynamics, environment, water transport and information technology.
3. IEEE Bulgaria Regional section of the institute of electrical and electronics engineers.
5. Wide Field Plate Database Contains the descriptive information for the astronomical wide-field (>1?) photographic observations stored in numerous archives all over the world.
