| Author's List |
| title | creator | language | description | tableOfContents | contributor | subject | created |
| Vivisection | Leffingwell, Albert, 1845-1916 | en | 2010-04-17 | ||||
| An Ethical Problem Or, Sidelights upon Scientific Experimentation on Man and Animals | Leffingwell, Albert, 1845-1916 | en | 2006-12-29 |