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On an improved optometer for estimating the degree of abnormal regular astigmatism / by John Tweedy.
- Tweedy, John, 1849-1924.
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About this work
[London] : [publisher not identified], 
4 pages : illustrations ; 23 cm
Reprinted, with additions and corrections, from The Lancet, Oct. 28, 1876
Where to find it
Location of original
This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)