1. Developmental horizons in human embryos. Description of age group XI, 13 to 20 somites, and age group XII, 21 to 29 somites;Streeter;Contrib Embryol Carnegie Inst,1942
2. 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 the lens vesicle;Streeter;Contrib Embryol Carnegie Inst,1945
3. Developmental horizons in human embryos. Description of age groups XV, XVI, XVII, and XVIII, being the third issue of a survey of the Carnegie Collection;Streeter;Contrib Embryol. Carnegie Inst,1948
4. Developmental horizons in human embryos. Description of age groups XIX, XX, XXI, XXII, and XXIII being the fifth issue of a survey of the Carnegie Collection;Streeter;Contrib Embryol Carnegie Inst,1954
5. Developmental horizons in human embryos. Description of age group X, 4 to 12 somites;Heuser;Contrib Embryol Carnegie Inst,1957