Earthjustice and Endangered Species Coalition.  Citizen's Guide to the Endangered Species Act,  www.earthjustice.org/library/references/Citizens_Guide_ESA

Reports 

The Congressional Research Service, The Endangered Species Act and "Sound Science", www.fas.org/sgp/crs/misc/RL32992.pdf

The National Academy of Sciences. Report on Science and the Endangered Species Act (1995),www.nap.edu/readingroom/books.esa

Scientific Resources

The Society of Conservation Biology, www.conbio.org, includes links to the Journal of Conservation Biology.

NatureServe, www.natureserve.org, an Online Encyclopedia of Life)

The National Library for the Environment, www.cnie.org, provides links to documents, including a decade of Congressional Research Service reports on ESA issues)