TY  - RPRT
TI  - Area requirements of grassland birds: A regional perspective
AU  - Douglas H. Johnson
AU  - Lawrence D. Igl
PY  - 2001
DO  - 10.1642/0004-8038(2001)118[0024:arogba]2.0.co;2
UR  - https://pubs.usgs.gov/publication/1001675
ID  - 1001675
ER  -