Opened book stack front
High Resolution JPEG Picture of Opened book on a stack in front of a blackboard with mathematical formulas
| Name | Bytes | Width | Height | DPI | Media Type |
|---|---|---|---|---|---|
| small | 173705 | 727 | 485 | 72 | image/jpeg |
| medium | 384577 | 1256 | 838 | 300 | image/jpeg |
| large | 893104 | 2123 | 1417 | 300 | image/jpeg |
| x_large | 2420605 | 3865 | 2580 | 300 | image/jpeg |
| xx_large | 5143082 | 6016 | 4016 | 300 | image/jpeg |