por Ali, Tariq [autor] | Stone, Oliver [autor] | Valle, Efrén del [traductor] | Ali, Tariq. On history | Stone, Oliver. On history.
por Gribbin, John R [autor] | Valle, Efrén del [traductor] | Belza, Cecilia [traductor] | Noriega, Luis [traductor] | Gribbin, John R. The reason why. The miracle of life on earth.