An anencephalic human embryo of 33.5 millimetres.

@article{Ford1956AnAH,
  title={An anencephalic human embryo of 33.5 millimetres.},
  author={E. H. R. Ford},
  journal={Acta anatomica},
  year={1956},
  volume={28 1-2},
  pages={149-55}
}