Self-Reliance Handbook/Snow Shelter Construction

General techniques

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Snow is a great insulator. Provide for some ventilation. Let it freeze once overnight before using if possible.

Quin-zhee

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One of the easiest ways to make a shelter in the snow is too just make a big pile of snow make sure it is compacted some and then dig into it. Yes, yes it is!

Igloo

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Other

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http://www.princeton.edu/~oa/winter/wintshel.shtml