TY  - RPRT
TI  - Wind assistance: A requirement for migration of shorebirds?
AU  - Robert W. Butler
AU  - Tony D. Williams
AU  - Nils Warnock
AU  - Mary Anne Bishop
PY  - 1997
DO  - 10.2307/4089246
UR  - https://pubs.usgs.gov/publication/70019770
ID  - 70019770
ER  -