In this volume, which is dedicated to H. Seifert, are papers based on talks given at the Isle of Thorns conference on low dimensional topology held in 1982.

List of participants; 1. Noeuds rigidement inversables M. Boileau; 2. The classification of Seifert fibred 3-orbifolds F. Bonahon and L. Siebenmann; 3. Exchangeable braids H. Morton; 4. Nilpotent coverings of links and Milnor's invariant K. Murasugi; 5. Presentation en ponts des noeuds rationelles J. P. Otal; 6. Piecewise linear I-equivalence of links D. Rolfsen; 7. Some closed incompressible surfaces in knot complements which survive surgery H. Short; 8. Simple elements of ¿2(M3, x0) B. Wicha-Krause; 9. A note on the mapping class group of surfaces and planar discontinuous groups H. Zieschang; 10. 'Zur Klassifikation höherdimensionaler Seifertscher Faserräume' B. Zimmerman; Problem list.