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→External resources
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1. Leafsnap is an on-line field guide, available as a free mobile app that uses visual recognition software to help identify tree species from photos of their leaves, flowers and fruits <ref>http://leafsnap.com/species/</ref>
1. Leafsnap is an on-line field guide, available as a free mobile app that uses visual recognition software to help identify tree species from photos of their leaves, flowers and fruits <ref>Columbia University, University of Maryland, Smithsonian Institute. 2018. Leafsnap. http://leafsnap.com/species/</ref>
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