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Federal Duck Stamp Program - http://www.fws.gov/duckstamps/
Federal Migratory Bird Hunting and Conservation Stamps, commonly known as “Ducks Stamps,” are pictorial stamps produced by the U.S. Postal Service for the U.S. Fish and Wildlife Service. They are not valid for postage |
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Mushroom Stamps - http://www.plant.uga.edu/mycology-herbarium/stamps.htm
A webpage on Mushrooms on Stamps |
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Volcanoes on stamps - http://www.iomoon.com/
Volcanoes on stamps with regional valcanoe maps |
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Isreali Birds - http://my.ort.org.il/holon/birds/index.html
Stamps of Isreali Birds listed by Family, Latin and English names |
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Meteorite Stamps and Coins - http://www.pibburns.com/catastro/metstamp.htm
Stamps and Coins on Meteorites, Comets and Craters |