TY  - GEN
AU  - Packard,Jane M.
AU  - Summers,Robert C.
AU  - Barnes,Lindsay B.
TI  - Variation of visibility bias during aerial surveys of manatees
KW  - MamÃ­feros acuÃ¡ticos
KW  - Censos aÃ©reos
KW  - Fauna
KW  - Trichechus
KW  - Trichechus manatus
KW  - manatÃ­
ER  -