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• Washington Metropolitan Area Transit Authority
  view article (9.9981365)

  Metro System Construction Safety Manual. Part 2.
  Washington Metropolitan Area Transit Authority
  Part 2, May 1969, 142 p.

• Washington Metropolitan Area Transit Authority
  view article (9.993612)

  Metro System Construction Safety Manual. Part 1.
  Washington Metropolitan Area Transit Authority
  April 1969, 207 p.