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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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Volcanoes on stamps - http://www.iomoon.com/
Volcanoes on stamps with regional valcanoe maps |
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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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Australian Flora on Postage Stamps Home Page - http://www.anbg.gov.au/stamps/
Information and illustrations of all Australian postage stamps depicting Australian flora. Site by the Australian National Botanical Gardens |
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Israeli Birds - http://my.ort.org.il/holon/birds/index.html
Stamps of Israeli Birds listed by Family, Latin and English names |