| Medical instruments and apparatus | 2 |
| Medical microscopy | 2 |
| Microscopes | 2 |
| Microscopy | 2 |
| Advertising | 1 |
| Authors, American--19th century--Correspondence | 1 |
| Carbonated Beverages | 1 |
| Children in advertising | 1 |
| Twain, Mark, 1835-1910--Correspondence | 1 |
| Williams, Walter, 1864-1935--Correspondence | 1 |
