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- Author(s):
- Verhoeff, F. H. (Frederick Herman), 1874-1968, author
- Publication:
- Chicago : Ophthalmic record, 1899
- Subject(s):
- Astigmatism -- diagnosis
Vision Tests -- instrumentation
- Author(s):
- Ziegler, S. Lewis (Samuel Lewis), 1861-1926 author
- Publication:
- St. Louis : [publisher not identified], [1893?]
- Subject(s):
- Vision Tests -- instrumentation
Optical Devices
Weights and Measures
- Author(s):
- Weiland, Carl, author
- Publication:
- [Philadelphia?] : [publisher not identified], [1894?]
- Subject(s):
- Vision, Binocular
Vision Tests -- instrumentation