1. A series of normal stages in the development of the chick embryo. 1951;Hamburger;Dev Dyn,1992
2. Developmental horizons in human embryos. Description of age group XI, 13-20 somites, and age group XII, 21-29 somites;Streeter;Contrib Embryol,1942
3. Developmental horizons in human embryos. Description of age group XIII, embryos about 4 or 5 millimeters long, and age group XIV, period of indentation of lens cesicle;Streeter;Contrib Embryol,1945
4. Developmental horizons in human embryos. Description of age group XI, 13-20 somites, age group XV, XVI, XVII, and XVII;Streeter;Contrib Embryol,1948