11. Snow-capped Southern Andes Collection: Billie Jean Isbell Andean Collection Set: Vertical ecology of the Andes: Overviews Location: Peru Andes Date: 1981 Format: Image
12. Southern Andes, snow-capped Collection: Billie Jean Isbell Andean Collection Set: Vertical ecology of the Andes: Overviews Location: Peru Andes Date: 1981 Format: Image
13. Southern Andes from the air Collection: Billie Jean Isbell Andean Collection Set: Vertical ecology of the Andes: Overviews Location: Peru Andes Date: 1981 Format: Image
14. Guaman Poma Mojones & Sucanca Collection: Billie Jean Isbell Andean Collection Set: Zenith sun series Location: Peru Date: 1982 Format: Image
15. Zenith - Anti-zenith Collection: Billie Jean Isbell Andean Collection Location: Peru Date: 1982 Format: Image