Flora of North America
This online book is a list of vascular plants and mosses in North America. Information on the characteristics, relationships, distribution, and biology of these species is included; the flora is searchable by volume. Note: this flora is still in the process of being compiled.
Birds of North America
The Birds of North America Online is a comprehensive reference covering the life histories of North American birds. Produced by the Cornell Lab of Ornithology, it includes detailed scientific information, illustrations, video, and sound recordings.
Natural Heritage Program List of the Rare Plant Species of North Carolina
This book lists North Carolina rare plant species. The most current edition can be found online through the North Carolina Natural Heritage Program website in pdf format.