MFPG: Innovation for Maintenance Technology Improvements : Proceedings of the 33rd Meeting of the Mechanical Falilures Prevention Group, Held at the National Bureau of Standards, Gaithersburg, MD, April 21-23, 1981

MFPG: Failure Prevention in Ground Transportation Systems : Proceedings of the 31st Meeting of the Mechanical Failures Prevention Group, Held at the National Bureau of Standards, Gaithersburg, MD, April 22-24, 1980