Icing is now inactive by channels being kept open by use of steam jet; Swamp crossing west of Tanacross, Alaska. Original caption: 45-18 - Icing is now inactive by channels being kept open by use of steam jet. Original caption: 45-19 - Swamp crossing west of Tanacross, Alaska, showing thick vegetal cover raised about 6 feet by hydrostatic pressure blocking the seepage channel. State: Alaska.

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Photo credit: © NB/PR / Alamy / Afripics
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