Grzimek's Animal Life Encyclopedia
17 volumes

The first revised edition in 30 years, Grzimek’s (pronounced Jiz`-meks) is the classic animal encyclopedia. Thorough articles familiarize readers with animals found everywhere on the globe, detailing their life cycles, predators, food systems, overall ecology and much more.

Beacham's Guide to the Endangered Species of North America
6 volumes

A guide to plants and aninals found in the United States that have been identified as threatened or endangered by the U.S. Fish and Wildlife Service.

UNEP-WCMC Animal & Plant Species Database

Identifies genus and species names from popular animal and plant names.

Synopsis and Classification of Living Organisms
2 volumes

Although more than 20 years old, this set is still helpful in identifying genus and species of different animals.

Encyclopedia of Evolution
2 volumes

This set is a good starting point to look up concepts surrounding the topic of evolution.

World Atlas of Biodiversity: Earth's Living Resources in the 21st Century

Good overview volume on the concept of biodiversity and the state of the world's biodiversity.

Encyclopedia of Biodiversity

Contains over 300 authoritative articles on all aspects of biodiversity.

Encyclopedia of Bioethics
5 volumes

Covers healthcare ethics in all its aspects, including fertility and reproduction, genetics, pediatrics, public health, mental health, human subjects and animal research, bioterrorism, organ donation and transplant, death and dying, and healthcare access. Includes cross-cultural approaches, comparative religious and philosophical ethics, and global perspectives.

Encyclopedia of the Biosphere
11 volumes

The emphasis is on human impact on the world's biosphere. Each volume covers a specific ecosystem.