| ID | 256650 |
| Call Number | D6,50fL185/H5/044493 |
| Title Proper | Relation between illumination and visnal efficiency - Effect of brightness contrast |
| Language | ENG |
| Author | Medical Research Council Industrial Health Research Board ; Ueston, H.C. |
| Publication | London, Official, 1945. |
| Description | 35p |
| Series | Report No. 87 |
| Price. Qualification | Pound 0.09(--) |
| Classification Number | D6,50fL185 |