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  1. 1
    Developmental horizons in human embryos : description of age group X, 4 to 12 somites /
    by Heuser, Chester H.
    Published 1957
    Book
  2. 2
    A human embryo with 14 pairs of somites /
    Book Chapter
  3. 3
    Two human embryos showing early stages of the definitive yolk sac /
    Book Chapter
  4. 4
    A presomite human embryo with a definite chorda canal /
    Book Chapter
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