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• Yokel, F. Y.; Tucker, R. L.; Reese, L. C.
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  Soil Classification for Construction Practice in Shallow Trenching. Building Science Series (Final).
  National Bureau of Standards, Washington, DC; Texas Univ., Austin
  Department of Labor, Washington, DC; Department of Health, Education, and Welfare,, NBS BSS 121, March 1980,

• Knab, L. I.; Yokel, F. Y.; Galligan, W. L.; Bendtsen, B. A.; Senft, J. F.
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  Study of Lumber Used for Bracing Trenches in the United States. Building Science Series (Final).
  National Bureau of Standards, Washington, DC; Forest Products Laboratory, Madison, WI; Purdue Univ., West Lafayette, IN
  Department of Labor, Washington, DC, NBS BSS 122, March 1980,

• Yokel, F. Y.
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  Recommended Technical Provisions for Construction Practice in Shoring and Sloping of Trenches and Excavations. Building Science Series (Final).
  National Bureau of Standards, Washington, DC
  Department of Labor, Washington, DC; Department of Health, Education, and Welfare, Washington, DC, NBS BSS 127, June 1980,