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Stamps printed in excessive quantities

According to an article in the Philatelic Webmaster Organization, some companies that have printed stamps on behalf of poor countries (especially in Africa) are printed in excessive quantities aimed at collecting.

Stamps are only apparently approved by local postal administrations,

The article mentions in particular

many stamps and leaflets related to minerals, from countries such as:

Chad, Comoros, Mali, Niger, Congo , 

Burundi, Guinea Rep., Guiné Bissau Rep.,

Solomon Is., S.Tome & Prince, Togolaise Rep.....

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Black number = Scott catalog​

Blue or  red number = Yvert et Tellier catalog

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Scientists of Geosciences

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Image	Country	Year	Subject	Yvert	Set
	BRASIL	1988	José Bonifácio de Andrada e Silva ​ 1763-1838 Brazilian statesman, naturalist, mineralist, professor ​ Mineral andradite	1869	1 val
	FINLAND	1960	Johan Gadolin ​ 1760-1852 ​ Finnish chemist, physicist and  mineralogist ​ Mineral Gadolinite	495	1 val

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Meteorites

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Image	Country	Year	Subject	Yvert	Set
	Guinè-Bissau	2023	Various meteorites	n.c.	3 val
	Guinè-Bissau	2023	Meteorite Tunguska and Jbilet Winselwan	BF	1 val
​	Guinè-Bissau	2023​	Meteorite Sikhote-Alin	BF	1 val
	Italia	2023	Meteorite Randazzo, Italy	n.c.	1 val

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Gems and Jewels FDC and Postcards

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Minerals FDC and Postcards

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