TY  - RPRT
TI  - Changes in breeding bird populations in North Dakota: 1967 to 1992-93
AU  - L.D. Igl
AU  - Douglas H. Johnson
PY  - 1997
DO  - 10.2307/4089067
UR  - https://pubs.usgs.gov/publication/1001134
ID  - 1001134
ER  -