Proceedings of the symposium on environmental engineering in coal mining : Proceedings of the First Conference on environmental engineering and metropolitan planning / Proceeding of the conference on environmental engineering IV Proceeding of the congress on environmental engineering Proceedings of the symposium on environmental engineering in coal mining : Harrogate 31st October, 1st and 2nd Novermber, 1972. Proceedings of the Symposium on aluminium in structural engineering / proceedings of the Twenty First Southern Biomedical Engineerings conference Proceedings of the symposium on fundamental aspects of high temperature corrosion / Proceedings of a symposium on aluminium in structural engineering : proceedings 4th Symposium on Small Computers in the Arts :