Incoming Resources
- Cadena alimenticia, Grace Hansen ; Spanish translator, Maria Puchol
- How ecosystems work, Julie K. Lundgren
- Organismos productores, Grace Hansen ; Spanish translator, Maria Puchol
- What are food chains & food webs?, Louise Spilsbury
- Redes de alimentos, Grace Hansen ; Spanish translator, Maria Puchol
- Organismos descomponedores, Grace Hansen
- How ecosystems work, by Julie K. Lundgren ; science content editor Shirley Duke, editor Kelli Hickse