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Ecology
2
QH540-549.5
Canada
1
Cystophora cristata
1
Halichoerus grypus
1
Phoca groenlandica
1
Phoca hispida
1
Phoca vitulina
1
Pseudoterranova decipiens
1
catch history
1
grey seals
1
harbour seals
1
harp seals
1
hooded seal
1
parasites
1
population dynamics
1
ringed seals
1
sealing
1
sealworms
1
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