Classic Alaskan Dog Team Post Covers from the 1940's

These first two covers are known as "Koestler" covers.

Dog sled cover, carried from Dillingham to Alekuagik, Alaska.

Dog sled cover carried from Holikachuk to Holy Cross, Alaska; a Koestler cover.

Dog sled cover postmarked at Shismaref, Alaska, and signed by two postmasters.

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