At head of title: Narodna republika Bŭlgarii︠a︡. Ministerstvo na informat︠s︡ii︠a︡ta i sŭobshtenii︠a︡ta. Ministerstvo na truda i sot︠s︡ialnite grizhi. Nauchno izsledovatelski institut po truda.
Prepared jointly by the Tsentralno statistichesko upravlenie and the institute.