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The 2017 National Electrical Estimator has a complete cross-referenced index. Find the subject you need in the left column. Then click on the subject link in the right column to jump to the costbook page.

2017 National Electrical Estimator

Subject Subject links
Two gang boxes 
  cast weatherproofTop of Page 145  
  fiberglassTwo gang boxes with Z-bracket, 1/4" offset and speed clamps  
  with ears, bracket and clampsTop of Page 138