Oral hygiene : a symposium held at Malmo, (Sweden, May 14th-15th, 1971)/ edited by Asger Frandsen

Long-term changes in coastal benthic communities : proceedings of a symposium, held in Brussels, Belgium, December 9-12, 1985 / edited by C. Heip, B.F. Keegan, and J.R. Lewis

Management and corporations 1985 : a symposium held on the occasion of the tenth anniversary of the Graduate School of Industrial Administration, Carnegie Institute of Technology / edited by Melvin Anshen, George Leland Bach

Large rock caverns : proceedings of the International Symposium (Finland: 25-28, 1986). vol.3/ edited by K.H.O. Saari

Methods of measurements and results of lower ionosphere structure : proceedings of the symposium held in Constance, F.R.G. / Edited by K. Rawer