| Information requests | |
| 1 | Improving content on photographic techniques |
| Examples | |
| 2 | Silhouettes |
| 3 | Drawing silhouettes |
| 4 | Phrenology proved, illustrated, and applied (1838) |
| The silhouette as a graphical element | |
| 5 | The silhouette as a graphic element within photography |
| Information requests | |
| 1 | Improving content on photographic techniques |
| Examples | |
| 2 | Silhouettes |
| 3 | Drawing silhouettes |
| 4 | Phrenology proved, illustrated, and applied (1838) |
| The silhouette as a graphical element | |
| 5 | The silhouette as a graphic element within photography |
