| title | creator | language | description | tableOfContents | contributor | subject | created |
| The Patient Observer
And His Friends | Strunsky, Simeon, 1879-1948 | en | | | | | 2006-09-22 |
| How to Observe
Morals and Manners | Martineau, Harriet, 1802-1876 | en | | | | | 2010-10-05 |
| The Observers | Vandenburg, G. L. | en | | | | Science fiction; Short stories | 2010-01-30 |
| Psychic Phenomena
A Brief Account of the Physical Manifestations Observed
in Psychical Research | Bennett, Edward T. | en | | | | | 2010-02-27 |
| Said the Observer | Stellman, Louis J. (Louis John), 1877-1961 | en | | | | | 2004-07-06 |
| How to Observe in Archaeology | Various | en | | | | Archaeology; Oriental antiquities | 2004-10-01 |
| The Rural Life Problem of the United States
Notes of an Irish Observer | Plunkett, Horace Curzon, Sir, 1854-1932 | en | | | | Farm life; Natural resources | 2008-11-21 |