GCNP: Water Temperature & Flow Variationsの無料動画を見ましょう
アニメーションの説明：
What you need to know to deal with cold Colorado River water, treating hypothermia, and how water level fluctuations will effect the way you camp by the river.
What you need to know to deal with cold Colorado River water, treating hypothermia, and how water level fluctuations will effect the way you camp by the river.