Muri Bhalissa: Bolivja - Bolol tal-posta (1950 - 1959) - 10 bolol.
9. October WM: Xejn Inċiżjoni: La Papelera S.A., La Paz. Perforazzjoni: 13½
![[Development of Petroleum Industry, Tip HZ]](https://www.stampworld.com/media/catalogue/Bolivia/Postage-stamps/HZ-s.jpg)
![[Development of Petroleum Industry, Tip HZ1]](https://www.stampworld.com/media/catalogue/Bolivia/Postage-stamps/HZ1-s.jpg)
![[Development of Petroleum Industry, Tip HZ2]](https://www.stampworld.com/media/catalogue/Bolivia/Postage-stamps/HZ2-s.jpg)
![[Development of Petroleum Industry, Tip HZ3]](https://www.stampworld.com/media/catalogue/Bolivia/Postage-stamps/HZ3-s.jpg)
![[Development of Petroleum Industry, Tip HZ4]](https://www.stampworld.com/media/catalogue/Bolivia/Postage-stamps/HZ4-s.jpg)
| Le. | Tip | D | Kulur | Deskrizzjoni |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 549 | HZ | 10B | ultramarine/blu ċar | (2.000.000) | 0.28 | - | 0.28 | - | USD |
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| 550 | HZ1 | 35B | karminju/safrani | (2.000.000) | 0.28 | - | 0.28 | - | USD |
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| 551 | HZ2 | 40B | aħdar /aħdar ċar | (1.000.000) | 0.28 | - | 0.28 | - | USD |
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| 552 | HZ3 | 50B | vjola/roża | (1.000.000) | 0.56 | - | 0.28 | - | USD |
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| 553 | HZ4 | 80B | kannella/kannella isfar | (1.000.000) | 0.85 | - | 0.28 | - | USD |
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| 549‑553 | 2.25 | - | 1.40 | - | USD |
9. October WM: Xejn Inċiżjoni: Litografias Unidas, La Paz. Perforazzjoni: 13½
![[Airmail - Development of Petroleum Industry, Tip IA]](https://www.stampworld.com/media/catalogue/Bolivia/Postage-stamps/IA-s.jpg)
![[Airmail - Development of Petroleum Industry, Tip IA1]](https://www.stampworld.com/media/catalogue/Bolivia/Postage-stamps/IA1-s.jpg)
![[Airmail - Development of Petroleum Industry, Tip IA2]](https://www.stampworld.com/media/catalogue/Bolivia/Postage-stamps/IA2-s.jpg)
![[Airmail - Development of Petroleum Industry, Tip IA3]](https://www.stampworld.com/media/catalogue/Bolivia/Postage-stamps/IA3-s.jpg)
![[Airmail - Development of Petroleum Industry, Tip IA4]](https://www.stampworld.com/media/catalogue/Bolivia/Postage-stamps/IA4-s.jpg)
| Le. | Tip | D | Kulur | Deskrizzjoni |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 554 | IA | 55B | blu ħadrani/blu ċar | (1.671.200) | 0.28 | - | 0.28 | - | USD |
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| 555 | IA1 | 70B | griż skur/griż blu | (1.300.000) | 0.56 | - | 0.28 | - | USD |
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| 556 | IA2 | 90B | aħdar skur/aħdar ċar | (1.300.000) | 0.85 | - | 0.28 | - | USD |
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| 557 | IA3 | 500B | vjola roża/multi kkulurita | (250.000) | 3.39 | - | 0.85 | - | USD |
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| 558 | IA4 | 1000B | kannella skur/kannella isfar | (80.000) | 5.65 | - | 1.69 | - | USD |
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| 554‑558 | 10.73 | - | 3.38 | - | USD |
