Incoming Resources
- El ciclo de vida de la lombriz de tierra, Bobbie Kalman
- An earthworm's life, written and illustrated by John Himmelman
- The life cycle of an earthworm, Bobbie Kalman
- Earthworms and their allies, by Frank E. Beddard, M.A. (Oxon.), F.R.S., F.R.S.E
- Science fair projects investigating earthworms, Lloyd H. Barrow
- Earthworms, Anita Yasuda
- Earthworms, Claire Llewellyn, Barrie Watts
- The earth moved, on the remarkable achievements of earthworms, by Amy Stewart
- La lombriz de tierra, Lola M. Schaefer ; traducción de Patricia Cano