Internet, http://id.loc.gov/, 2015-10-07
L'hérédité et le milieu : leur rôle dans le développement de l'homme / Edwin Grant
Conklin, 1920
The embryology of Crepidula : a contribution to the cell lineage and early development
of some marine gasteropods : an Abstract of dissertation submitted to the board of
university studies of the Johns Hopkins University for the degree of doctor of philosophy,
june 11, 1891/by Edwin Grant Conklin ..., 1891/97