| title | creator | language | description | tableOfContents | contributor | subject | created |
| The Underground City, or, the Child of the Cavern | Verne, Jules, 1828-1905 | en | Translation of Les indes-noirs | | | Science fiction; Adventure stories | 1998-06-01 |
| Godfrey Marten, Undergraduate | Turley, Charles, 1868-1940 | en | | | | | 2009-04-20 |
| Tom Swift in the Land of Wonders, or, the Underground Search for the Idol of Gold | Appleton, Victor [pseud.] | en | | | | Swift, Tom (Fictitious character) -- Juvenile fiction; Adventure and adventurers -- Juvenile fiction | 1996-04-01 |
| Tom Swift in the City of Gold, or, Marvelous Adventures Underground | Appleton, Victor [pseud.] | en | | | | Swift, Tom (Fictitious character) -- Juvenile fiction; Extinct cities -- Juvenile fiction; Mexico -- Juvenile fiction; Adventure and adventurers -- Juvenile fiction | 2003-12-01 |
| Underground Man | Tarde, Gabriel | en | | | Brereton, Cloudesley Shovell Henry, 1863-1937 [Translator] | | 2010-08-27 |
| The Underground Railroad
A Record of Facts, Authentic Narratives, Letters, &c., Narrating the Hardships, Hair-Breadth Escapes and Death Struggles of the Slaves in Their Efforts for Freedom, As Related by Themselves and Others, or Witnessed by the Aut | Still, William | en | | | | Underground Railroad; Fugitive slaves -- United States -- History -- 19th century; Antislavery movements -- United States -- History -- 19th century; Fugitive slaves -- United States -- Biography; Abolitionists -- United States -- Biography | 2005-03-05 |
| Notes from the Underground | Dostoyevsky, Fyodor, 1821-1881 | en | | | | Russia -- Officials and employees -- Fiction; Political fiction; Russia -- History -- 1801-1917 -- Fiction | 1996-07-01 |