TY  - RPRT
TI  - Fixed-wing airplane versus helicopter surveys of manatees (Trichechus manatus)
AU  - Galen B. Rathbun
PY  - 2006
DO  - 10.1111/j.1748-7692.1988.tb00185.x
UR  - https://pubs.usgs.gov/publication/1007841
ID  - 1007841
ER  -