Energy of BAM ІІ
on the verso side: circled figure “2” in the upper right corner; below – title “Энергия БАМ(у) ІІ”, stamp with inscurption “СССР, 310003, г Харьков-3, А. Я. 185, РУПИН ЮРИЙ К. | USSR 310003, Charkov-3, P. O. Box 185, RUPIN JURIJ K....
Energy of BAM І
on the verso side: circled figure “1” in the upper right corner; below – title “Энергия БАМ(у) І”, stamp with isncription “СССР, 310003, г Харьков-3, А. Я. 185, РУПИН ЮРИЙ К. | USSR 310003, Charkov-3, P. O. Box 185, RUPIN JURIJ...