1. Anon 1931
2. The times of activity of certain nocturnal insects, chiefly Lepidoptera, as indicated by a Light;Williams;Trap. Trans. R. ent. Xoc. Lond.,1935
3. The influence of moonlight on the activity of certain nocturnal insects, particularly of the family NOCTUIDAE, as indicated by a Light;Williams;Trap. Phil. Trans. Roy. Xoc. Lond. (B),1936a
4. A modified Greenwich night-cloud recorder used for ecological work.;Williams;J. anirn. Ecology,1936b
5. Williams , C. B. 1937