Materiali za obuchenie na uchashtite se ot pionerskite lageri i srednoshkolskite brigadi po bezopasnostta na dvizhenieto
By: Boris Petrov.
Publisher: Ministerstvo na nar. prosveta; Upr. KAT-DNM
Published: 1979
Place of publication: Sofii͡a︡
Language: bul
Number of pages: 62