"Digital images, in several resolutions, of radial, tangential, and cross-sections of 350 North American woods from the 14-volume rare book The American Woods...

"This guide presents extensive data on the habitats and ecosystems of more than 1,200 species identified as endangered or threatened by the US Fish and Wildlife service...

An ongoing series of volumes dealing with most aspects of plant physiology...

"Introduces the fundamentals of plant sciences, such as cells, transportation and photosynthesis, and also examines related fields, such as agribusiness, conservation and ethnobotany...