(Noordwijkerhout)International Conference on the Internal ��� External protection of Pipes International Conference on the Internal & External protection of Pipes International Conference on the Internal and External Protection of Pipes (Noordwijkerhout)International Conference on Science of Ceramics Proceedings of the 1st International Conference on the Internal and External Protection of Pipes.Sept.9-11,1975,Durham (Noordwijkerhout)International Conference on Fluid Sealing