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  • Geoff York, USGS biologist takes weight measurements of a polar bear (Ursus maritimus) on the ice pack of the Beaufort Sea. Kaktovik, Alaska.
    D124409.jpg
  • Steve Amstrup and Geoff York, USGS biologists, taking field data from an immobilized large male polar bear (Ursus maritimus). Kaktovik, Alaska..
    D123940.jpg
  • Steve Amstrup, lead USGS polar bear biologist prepares for a day of field work in Kaktovik, Alaska.
    D123851.jpg
  • Geoff York, a USGS biologist, collecting data from a polar bear (Ursus maritimus) on the Beaufort Sea ice. Using a block and tackle to take weight measurments.  Kaktovik, Alaska.
    D123726.jpg
  • Geoff York ,a USGS biologist, collecting data from a polar bear  (Ursus maritimus) on the Beaufort Sea ice. Kaktovik, Alaska.
    D123686.jpg
  • Geoff York, a USGS biologist,  prepares a polar bear (Ursus maritimus) to start doing their research. Kaktovik, Alaska.
    D123670.jpg
  • Dr. Steve Amstrup, USGS biologist,  and his assitant Kristin Simac, prepare a large male polar bear (Ursus maritimus) for data collection on the ice pack of the Beaufort Sea. Kaktovik, Alaska.
    D124901.jpg
  • Geoff York, USGS biologist and assistant Karen Rode take weight measurements of a captured polar bear (Ursus maritimus) on the pack ice of the Beaufort Sea. Kaktovik, Alaska.
    D124398.jpg
  • Steve Amstrup and Geoff York, USGS biologists, taking field data from an immobilized large male polar bear (Ursus maritimus). Kaktovik, Alaska.
    D123928.jpg
  • Geoff York, a USGS biologist  taking measurements of a polar bear (Ursus maritimus) on the Beaufort Sea ice. Kaktovik, Alaska.
    D123789.jpg
  • Geoff York, a USGS biologist uses a portable block and tackle device to take weight measurements of a polar bear (Ursus maritimus) on the Beaufort Sea ice. Kaktovik, Alaska.
    D123768.jpg
  • Geoff York ,a USGS biologist, collecting data from a polar bear  (Ursus maritimus) on the Beaufort Sea ice. Kaktovik, Alaska.
    D123688.jpg
  • Geoff York, a USGS biologist,  prepares a polar bear (Ursus maritimus) to start doing their research. Kaktovik, Alaska.
    D123668.jpg
  • Geoff York, USGS biologist and Katrina Knott, research assistant, prepare a polar bear (Ursus maritimus) to start doing their research. Kaktovik, Alaska.
    D123661.jpg

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