A pair of strabismus diagnostic and exercise cards in black and white. The card to the left, 2, has the image of a folded umbrella shade; the card to the right, 2a, has the image of an umbrella stick. Stereoskopische Bilder für schielende Kinder.
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Hidden treasure and Is part of: Stereoskopische Bilder für schielende Kinder.; See related catalog record: 52331180R