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Documentation for a snow study by Lyle Watts in a national forest in Idaho showing two patches of melted snow. Each has a stick lying horizontally across it. This are possibly yardsticks to show the amount of snow melt that has taken place. The back of the photo reads, " 4/29/31 - 2.00 PM Stop. 5.6 Time 1/150s - East. Verichrome - Bright sun Snow - Dirt. Temperatures. Snow Recession Study." This photo is similar to 2009-2935.