translate English to French: Derek York, Planet Earth (1976) and "The Earliest History of the Earth," Scientific American 268, 1 (1993); G. Brent Dalrymple, The Age of the Earth (1991); Donald C. Johanson, "Face to Face With Lucy's Family," National Geographic 189, 3 (1996).
Derek York, Planet Earth (1976) et « The Earliest History of the Earth » , Scientific American, 268, 1 (1993); G. Brent Dalrymple, The Age of the Earth (1991); Donald C. Johanson, « Face to Face With Lucy's Family », National Geographic, 189, 3 (1996).