Sustainable agricultural systems [microform] : hearings before the Subcommittee on Department Operations, Research, and Foreign Agriculture of the Committee on Agriculture, House of Representatives, Ninety-seventh Congress, second session, April 16, 1982, Ontario, Calif., April 22 and 27, 1982, Washington, D.C.

"Serial no. 97-PPP."

Ecosystem disturbance and wildlife conservation in western grasslands : a symposium proceedings /

"Sponsors: The Wildlife Society's Working Group on Sustainable Use of Ecosystem Resources ... [et al.]."