TY  - RPRT
TI  - Christmas Bird Count provides insights into population change in land birds that breed in the boreal forest
AU  - D.K. Niven
AU  - J.R. Sauer
AU  - G.S. Butcher
AU  - W.A. Link
PY  - 2004
UR  - https://pubs.usgs.gov/publication/5224484
ID  - 5224484
ER  -