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- Author(s):
- Weiland, Carl, author
- Publication:
- [Philadelphia?] : [publisher not identified], [1893?]
- Subject(s):
- Refraction, Ocular
Retinoscopes
- Author(s):
- Weiland, Carl, author
- Publication:
- [Philadelphia?] : [publisher not identified], [1894?]
- Subject(s):
- Vision, Binocular
Vision Tests -- instrumentation
- Author(s):
- Weiland, Carl, author
- Publication:
- Philadelphia : Lea Brothers & Co., [1892?]
- Subject(s):
- Astigmatism -- diagnosis
Diagnostic Techniques, Ophthalmological -- instrumentation
Equipment Failure