100th Anniversary of the Geneva Conference on Organic Nomenclature issue of Switzerland
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Short desc: 100th Anniversary of the Geneva Conference on Organic Nomenclature
Issuer: Switzerland Date: 3/24/1992 Occasion: Geneva Conference on Organic Nomenclature Number/Year: 100 Consists of 1 stamp: (See stamps as list) 90(c) d=Difluorbutane molecule 3 different formula All are perf=11.75 |
