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Aerial survey
1
Anas acuta
1
Anser albifrons
1
Branta hutchinsii
1
Clangula hyemalis
1
Cygnus columbianus
1
Gavia spp
1
Grus canadensis
1
Lagopus spp
1
Life sciences
1
Somateria spectabilis
1
detection probability
1
distance-sampling
1
envir
mark-recapture
1
medicine and health care
population estimation
1
socio
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