First Day Cover commemorating the 9th World Petroleum Conference, Tokyo
- 1975
Cachet, stamp, and postmark depict oil derricks.
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Cite as
“First Day Cover Commemorating the 9th World Petroleum Conference, Tokyo.” Japan, 1975. Witco Stamp Collection, Box 7. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/d504rk35q.
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