What is this Man Doing?

Chuck Ditmars, the first lab manager for the Local Roads Program, taking the first of two readings for the Sand Equivalent test in 1955
Photo taken in the Cornell Local Roads Program lab in 1955

Answer

Spring 2013

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This work by the Cornell Local Roads Program (CLRP) is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License.