Part of the survival training was that if you get lost or stranded is to dig into a snow bank for protection from the cold & wind. We built temporary shelters out of a 'tent half' and snow. Find some low branches to hold up one end, and cover everything except a small downwind opening with snow.
-- You can't have a sense of humor, if you have no sense.
Thanks Bill. I also got to see the interesting contents at the link you posted - it worked for me today.
Ed
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