Official websites use .gov A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
A pair of strabismus diagnostic and exercise cards in black and white. The card to the left, 47, has the image of a cresent moon with a sad face and one large star in front of it and a smaller star above to the right; the card to the right, 47a, shows image of a cresent moon with a sad face and one large star in front of it and another smaller star under it. Stereoskopische Bilder für schielende Kinder.
Copyright:
This item may be under copyright protection. Please ask copyright owner for permission before publishing.
Related Title(s):
Hidden treasure and Is part of: Stereoskopische Bilder für schielende Kinder.; (DNLM)52331180R