TY  - RPRT
TI  - Seasonal distribution of bird populations at the Patuxent Research Refuge
AU  - R. E. Stewart
AU  - J.B. Cope
AU  - C.S. Robbins
AU  - J.W. Brainerd
PY  - 2000
UR  - https://pubs.usgs.gov/publication/5222380
ID  - 5222380
ER  -