The four essential elements of habitat
Subtitle: food, water, cover, space
Publisher: U.S. Dept. of the Interior, U.S. Fish and Wildlife Service
Published: 2002
Place of publication: Washington, D.C
Language: eng
Format: [electronic resource] :
Subjects: Birds; Habitat; Conservation; Plant conservation; Conservation of natural resources
Other titles: Food, water, cover, space
Notes: Title from title screen (viewed July 23, 2009).

"January 2002."

Mode of access: Internet from the FWS web site. Address as of 7/23/09: http://library.fws.gov/Bird_Publications/ElementsofHabitat.pdf; current access available via PURL.