H.  Krebs, The West-Indian marine shells, with some remarks. A manuscript printed for circulation betweenn collectors, by H. Krebs, 1864. A republication by W.J. Clench, C. G. Aguayo and R.D. Turner, with remarks and a brief account of the life of H. Krebs. [Reprint. Habana, Cuba: Museo Poey, Universidad de la Habana, 1948, p. ??