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» Ginkgo digitata 
Fossil image.
http://www.toyen.uio.no/palmus/galleri/montre/english/a31709.htm
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» Ginkgoaceae 
Taxonomic information and botanical description for Class Ginkgoopsida, Order Ginkgoales, Family Ginkgoaceae, and Genus Ginkgo.
http://www.conifers.org/gi/
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» Ginkgoales: Fossil Record 
Illustrated discussion of the fossil record of ginkgos through the Tertiary.
http://www.ucmp.berkeley.edu/seedplants/ginkgoales/ginkgofr.html
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» Ginkgophytes 
Brief discussion of the lineage that originated in the late Paleozoic, became quite diverse during the Mesozoic, and is now represented by one species. Includes fossil images.
http://taggart.glg.msu.edu/isb200/ginkgo.htm
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