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Woods Hole Open Access Server
Title: Holtfreter notebook page showing cells time sequence after treatment with KOH (potassium hydroxide)
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Woods Hole Open Access Server
Title: Lightly colored sketches of exogastrula showing the movement of cells
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Woods Hole Open Access Server
Title: Holtfreter notebook page showing cellular movement around the blastopore, some cells in blue
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Woods Hole Open Access Server
Title: Holtfreter notebook page showing cellular movement and deformation along the neural folds
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Woods Hole Open Access Server
Title: Leuckart Chart, Series I, Chart 100: Vermes; Nemathelminthes; Acanthocephali; Echinorhynchus gigas etc