The original paper by Richard L. Hay and Mary D. Leakey about the amazing discovery of Laetoli footprints.
L'articolo originale scritto da Richard L. Hay and Mary D. Leakey sull'incredibile scoperta delle orme di Laetoli
Pliocene footprints in the Laetoli Beds at Laetoli, northern Tanzania
by M. D. Leakey and R. L. Hay
1979
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