1. Imbabura Collection: Billie Jean Isbell Andean Collection Set: Vertical ecology of the Andes: Valley Location: Imbabura (Ecuador) Date: 1981 Format: Image
2. Hillside agriculture, Imbabura Collection: Billie Jean Isbell Andean Collection Set: Vertical ecology of the Andes: Valley Location: Imbabura (Ecuador) Date: 1981 Format: Image
3. Hillside agriculture, Imbabura Collection: Billie Jean Isbell Andean Collection Set: Vertical ecology of the Andes: Valley Location: Imbabura (Ecuador) Date: 1981 Format: Image
4. Imbabura Collection: Billie Jean Isbell Andean Collection Set: Vertical ecology of the Andes: Valley Location: Imbabura (Ecuador) Date: 1981 Format: Image
5. Quito from Pichincha Collection: Billie Jean Isbell Andean Collection Set: Vertical ecology of the Andes: Valley Location: Quito (Ecuador) Date: 1981 Format: Image