There is a 10,000 entry subject index at the end of volume 3. Includes 370 articles from 28 areas of the life sciences. Each article adheres to a common format, including definition of term, its relationship to other fields of study, a summary and a bibliography. There is an index at the end of volume 6. Encyclopedia of Bioethics .
Articles are comprehensive and include cross-references and bibliographies.
Grzimek's Encyclopedia of Evolution . Encyclopedia of Human Biology . This four-volume set attempts to survey the field and it does a very able job of doing that. Each article includes a glossary, a lengthy summary of the subject and a bibliography of recent research. Encyclopedia of Microscopy .