MOSCOW, RUSSIA - SEPTEMBER 15, 2018: A stamp printed in Bulgaria shows Blast furnaces near Sofia, 20 Years of popular power serie, circa 1964

---

Size: 5886px × 3053px
Photo credit: © Alexander Mitrofanov / Alamy / Afripics
License: Royalty Free
Model Released: No

Keywords: 4, 20, 1964, anniversaries, antique, art, blast, building, bulgaria, circa, correspondence, design, envelope, flag, furnaces, heritage, historic, hobby, image, industry, issue, jubilees, letter, mail, national, philatelic, philately, plant, popular, post, postage, postal, postmark, power, sofia, stamp, vintage, year