Section headings and papers. Asymmetric Synthesis of Azetidinones, J H Bateson. Annelation Effects in the Thiophene Series, S Gronowitz and A B Hornfeldt. Three-Membered Ring Systems, A Padwa & F R Kinder. Four-Membered Ring Systems, J Parrick. Five-Membered Ring Systems. Thiophenes and Se and Te analogs, J B Press & R K Russell. Pyrroles and benzo derivatives, R J Sundberg. Furans and benzo derivatives, C W Bird. With more than one N atom, S A Lang Jr & V J Lee. With N and S (Se) atoms, R Tanaka & I Shinkai. With O and S (Se, Te) atoms, R A Aitken. With O and N atoms, G V Boyd. Six-Membered Ring Systems. Pyridine and benzo derivatives, J G Keay & A R Sherman. Diazines and benzo derivatives, T J Kress & D L Varie. Triazines, tetrazines and fused ring polyaza systems, D T Hurst. With O and/or S atoms, J D Hepworth. Seven-Membered Rings, J M Kane & N P Peet. Eight-Membered and Larger Rings, G R Newkome. Subject index.