A pair of strabismus diagnostic and exercise cards in black and white. The card to the left, 29, has the image of a transparent cube with the front sides in dotted lines and a downward arrow over it; the card to the right, 29a, has the image of a transparent cube with the front sides in dotted lines and a heart under it. Stereoskopische Bilder für schielende Kinder.
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Related Title(s):
Hidden treasure and Is part of: Stereoskopische Bilder für schielende Kinder.; See related catalog record: 52331180R