75 godini borba i sŭzidanie
by Ivan Radev, Dimitŭr Dimitrov
AnniversariesProfsŭi︠u︡z na minʹorite, metalurzite, energetit︠s︡ite i geolozite (Bulgaria)
Writing a summary for young readers…
For young readers
Book data: Open Library
by Ivan Radev, Dimitŭr Dimitrov
Book data: Open Library