[J] American Geologist, vol. viii, p. 241.
[K] Transactions of the Leeds Geological Association for February 10, 1893.
[L] Quarterly Journal of the Geological Society, August, 1891.
[M] Fortnightly Review, November, 1893, p. 633; reprinted in The Popular Science Monthly, vol. xliv, p. 790.
[N] La Période glaciaire (Félix Alcan. Paris, 1889).
[O] American Geologist, vol. viii, p. 242.
[P] Ibid., p. 241.
[Q] Ibid., p. 242.
[R] Congrès International d’Archéologie, Moscow, 1892.
[S] Nineteenth Century, January, 1894, p. 151, note.