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AMD
537
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203
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199
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Southern Ocean
Antarctic
385
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207
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72
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48
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43
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41
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36
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30
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29
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29
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23
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18
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17
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14
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12
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12
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11
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10
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10
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10
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9
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9
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9
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9
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8
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Sea ice
Southern Ocean
537
Antarc*
523
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408
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385
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174
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72
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48
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45
Australian Antarctic Division
38
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30
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25
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walrus*
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baleen whales
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17
toothed whales
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16
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14
Macquarie Island
14
International Polar Year
13
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13
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12
National Snow and Ice Data Center
12
IPY
11
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11
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10
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