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This was where he began his wildlife studies tracking grizzly bears , cougars , caribou , bald eagles and killer whales , which over three years developed into the book Alone In The Wilderness , which was snapped up by Reader 's Digest and became a critically acclaimed best seller .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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