TY  - RPRT
TI  - Distribution and ecology of whistling swans in the Chesapeake Bay region
AU  - R. E. Stewart
AU  - J.H. Manning
PY  - 1958
DO  - 10.2307/4081890
UR  - https://pubs.usgs.gov/publication/5220113
ID  - 5220113
ER  -