(17) Eccardus, 1750.1.
(18) Mahudel, 1740.1.
(19) Buckland, 1824.1.
(20) Godwin-Austen, 1840.1.
(21) Christol, 1820.1.
(22) Schmerling, 1833.1.
(23) Boucher de Perthes, 1846.1.
(24) Op. cit.
(25) Rigollot, 1854.1.
(26) Lubbock, 1862.1.
(17) Eccardus, 1750.1.
(18) Mahudel, 1740.1.
(19) Buckland, 1824.1.
(20) Godwin-Austen, 1840.1.
(21) Christol, 1820.1.
(22) Schmerling, 1833.1.
(23) Boucher de Perthes, 1846.1.
(24) Op. cit.
(25) Rigollot, 1854.1.
(26) Lubbock, 1862.1.