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The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. Fig. 133. — Circulation in the embryo and the yolk-sac. Stage of about 16 s; from below.
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The development of the chick : an introduction to embryology. Embryology; Chickens -- Embryos. Fig. 134. — Circulation in the embryo and the yolk-sac at the stage of about 22 s,
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