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  Air Force Research Laboratory
  API - American Petroleum Institute
  Article by Phil Herman in ASNT’s The NDT Technician entitled “Manufacturing NDT Reference Standards” (PDF)
  ASM - American Society of Metals
  ASME - American Society of Mechanical Engineers
  ASNT - American Society of Nondestructive Testing
  ASNT - Central Florida Section
  Association of American Railroads
  ASTM - American Society of Testing and Materials
  AWS - American Welding Society
  British Institute for Nondestructive Testing
  British Standards Institute
  Canadian Institute for Nondestructive Testing
  Canadian Standards Association
  Center for Nondestructive Evaluation - Iowa State University
  Currency Converter
  Electrical Conductivity and Resistivity of Aluminum Alloys (PDF file)
  Electrical Conductivity of Metals
  EPRI - Electric Power Research Institute
  FAA - The Federal Aviation Administration
  NDT Cabin - Internet Magazine
  NDT net
  NDT Resource Center
  NIST - National Institute of Standards and Technology
  NRC - Nuclear Regulatory Commission
  The U.S. Department of Transportation
  The Welding Institute
  Ultrasonic Velocity Table
  What is NDT - basic explanation of NDT principles and where it is commonly used (1-page PDF document)
  What is a Reference Standard - from ASNT's The NDT Technician (PDF file)