Visual test-types, test-characters, test-letters, and a uniform central test-object for measuring the acuity of vision - special instructions for the use of visual test-types in schools and industrial establishments
- Författare
- Arthur Eugene Ewing
- (A. E. Ewing.)
- Språk
- Engelska
| Förlag | År | Ort | Om boken | ISBN |
|---|---|---|---|---|
| Mosby | 1926 | USA, St. Louis | 14 sidor. Ill. 8:o |