- 1Friedrich Ziegler, Development of the human urogenital apparatus, 1896
EMBRYO, urogenital, @MKR - 2Friedrich Ziegler, Anatomy of human embryos, 1888
EMBRYO, @MKT - 3Friedrich Ziegler, Human embryos of the first month of pregnancy, 1885
EMBRYO, @MKU - 4Friedrich Ziegler, Wax models showing the anatomy of human embryos, 1888
EMBRYO, @MKV