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In two centuries of American ornithology, The Birds of North America (BNA) is only the fourth comprehensive reference covering the life histories of North American birds. This series provides detailed scientific for each of the 716 species of birds nesting in the USA and Canada. The print version of BNA ... [Information of the supplier, modified]
bna.birds.cornell.edu/BNA/
NatureServe Explorer provides conservation status, taxonomy, distribution, and life history information for more than 50,000 plants, animals, and ecological communities and systems in the United States and Canada. The data available through NatureServe Explorer represent a "snapshot" of the U.S. and ... [Information of the supplier]
www.natureserve.org/explorer/
Plant Information Online offers a collection of databases of interest to plant and gardening enthusiasts and students, as well as professional botanists, horticulturists, and researchers. Some of the databases have been available in print (various titles) since 1979 and online through paid subscription ... [Information of the supplier]
plantinfo.umn.edu/
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