الغلاف الخلفي

‏[مصدر الصور]‏

Page 5 Butterfly: ©Ron Austing, Photo Researchers;

Page 9 Masked medicine man: ©T. D. Friedman, Photo Researchers;

Page 9 Soldiers with cannon: ©Art Stein, Photo Researchers;

Page 24 Fetus: ©Petit Format/Nestle/Photo Researchers