The authors and editors of Topics in Endangered Species have identified the following free online resources of information updating the themes explored in the compilation:
US Fish and Wildlife Service Endangered Species Program.
http://www.fws.gov/endangered/
Noah's Options: Initial Cost Estimates of a National System of Habitat Conservation Areas in the United States. Shaffer ML, Casey F, Scott JM. 2002.
http://www.jstor.org/stoken/ucaltoken/u5FGqqiRiPJIKDGSZ9Rj/full
Wildlife habitat policy research program, National Council for Science and the Environment.
http://ncseonline.org/program/wildlife-habitat-policy-research-program
Publications of Curtis H Flather.
http://www.fs.fed.us/rmrs/profiles/?laster=Flath&first=Curtis+H
Beyond Reserves and Corridors: Policy Solutions to Facilitate the Movement of Animals and Plants in a Changing Climate. John Kostyack, Joshua J. Lawler, Dale D. Goble, Julian D. Olden, and J. Michael Scott. 2011.
http://www.jstor.org/stoken/ucaltoken/udM4M382scC8b74FkPYe/full
