Bulgaria
The plant is in Galabovo, not Dimitrovgrad
| Country: | Bulgaria |
| Type: | Postage stamps |
| Series: | Construction of socialism |
| Nominal: | 13 ст |
| Year: | 1971 |
| Perforation: | comb 13 |
| Mintage: | 6,000,000 |
Construction of socialism
 semiconductor plant in Botevgrad 0.07$ |  Petrochemical Combine Pleven 0.07$ |  chemical plant in Vratsa 0.08$ |  Maritza East in Dimitrovgrad |
 Combine "Elektronika", Sofia 0.08$ |