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Alaska Region

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Repeat oblique photographs of Gulkana glaciers in Alaska.
December 31, 1967

Repeat oblique photographs of Gulkana glaciers in Alaska.

Repeat oblique photographs of Gulkana glaciers in Alaska.  1967, Unknown USGS photographer. 2016, L. Sass, USGS.

Repeat oblique photographs of Wolverine glacier in Alaska.
December 31, 1966

Repeat oblique photographs of Wolverine glacier in Alaska.

Repeat oblique photographs of Wolverine glacier in Alaska.  1966 image by unknown USGS photographer; 2015 image by L. Sass, USGS.

 Allen Bondurant measuring depth to permafrost along a thermokarst lake shore

Allen Bondurant measuring depth to permafrost along a thermokarst lake shore

Allen Bondurant measuring depth to permafrost along a thermokarst lake shore

Attribution: Alaska
Crumbling blocks of permafrost along the Beaufort Coast

Crumbling blocks of permafrost along the Beaufort Coast

Crumbling blocks of permafrost along the Beaufort Coast

Attribution: Alaska