1. Introduction a l'étude écologique des communautés de microarthropodes corticoles soumises a la pollution atmospherique. II. Recherche de bioindicateurs et d'indices biologiques de pollution;André;Annls Soc. R. Zool. Belg.,1977
2. Combatting rickets;Anon;Nature, Lond.,1977
3. Arctosa perita (Latr.) from colliery spoil heaps in Warwickshire and Leicestershire;Arnold;Bull. Br. Spider Study Group,1967
4. Atmospheric pollution and melanic moths in Manchester and its environs;Askew;J. appl. Ecol.,1971
5. Melanism in the Scalloped Hazel, Gonodontis bidentata Clerck;Aston;Ent. Rec.,1960