Mezhdunarodni organizat͡s︡ii po standartizat͡s︡ii͡a︡Simeon Delchev Simeonov · First published 1985Open the Tome
Sŭstav i funktsii na uchrezhdenii︠a︡ta v Iztochna Rumelii︠a︡Simeon Simeonov · First published 1979Open the Tome
La production et l'exportation du tabac bulgareSiméon L. Simeonov · First published 1946Open the Tome
