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• NAHB Research Center
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  Stair Safety: A Review of the Literature and Data Concerning Stair Geometry and Other Characteristics.
  NAHB Research Center, Upper Marlboro, MD
  Instrument No. DU100K00005897
  Department of Housing and Urban Development, Washington, DC, Instrument No. DU100K00005897
  November 30, 1992
  95 p.