| title | creator | language | description | tableOfContents | contributor | subject | created |
| An Outline of Occult Science | Steiner, Rudolf, 1861-1925 | en | | | | Occultism; Theosophy; Anthroposophy | 2009-12-20 |
| Naturalism And Religion | Otto, Rudolf, 1869-1937 | en | | | | | 2009-03-27 |
| Strijd tusschen Boer en Brit. English | De Wet, Christiaan Rudolf, 1854-1922 | en | | | | De Wet, Christiaan Rudolf, 1854-1922; South African War, 1899-1902 -- Personal narratives; Transvaal (South Africa) -- History -- 1880-1910; South Africa -- Biography | 2006-07-08 |
| The Surprising Adventures of Baron Munchausen | Raspe, Rudolf Erich, 1737-1794 | en | | | | German wit and humor; Fantasy | 2006-04-06 |
| An Interpretation of Rudolf Eucken's Philosophy | Jones, W. Tudor (William Tudor), 1865-1946 | en | | | | | 2005-10-09 |
| Frontier Boys in the South Seas | Roosevelt, Wyn, 1870- | en | | | Mencl, Rudolf [Illustrator] | | 2010-04-21 |
| Christentum als mystische Tatsache und die Mysterien des Altertums. English | Steiner, Rudolf, 1861-1925 | en | | | Collison, Harry [Editor] | Mysticism; Christianity and other religions; Mysteries, Religious; Anthroposophy | 2008-02-04 |
| The Theories of Darwin and Their Relation to Philosophy, Religion, and Morality | Schmid, Rudolf, 1828-1907 | en | | | Zimmermann, G. A. (Gustav Adolf), 1850-1903 [Translator] | Evolution; Religion and science | 2007-07-26 |
| On the Heels of De Wet | James, Lionel, 1871-1955 | en | | | | De Wet, Christiaan Rudolf, 1854-1922; South African War, 1899-1902 -- Personal narratives | 2007-01-19 |
| Freie wissenschaft und freie lehr. English | Haeckel, Ernst Heinrich Philipp August, 1834-1919 | en | | | Huxley, Thomas Henry, 1825-1895 [Commentator] | Evolution (Biology); Teaching, Freedom of; Virchow, Rudolf Ludwig Karl, 1821-1902. Freiheit der Wissenschaft im modernen Staat; Science -- Study and teaching | 2008-06-06 |
| The Boy Scouts on the Yukon | Victor, Ralph | en | | | Mencl, Rudolf [Illustrator] | Boy Scouts of America -- Juvenile fiction; Alaska -- Juvenile fiction | 2008-08-10 |
| The Former Philippines thru Foreign Eyes | | en | | Feodor Jagor's Travels in the Philippines (the out-of-print 1875 English translation corrected from the original German text) -- The state of the Philippines in 1810, by Tomas de Comyn (William Walton's 1821 translation modernized) -- Manila and Sulu in 1842, by Com. Chas. Wilkes (Narrative of U.S. exploring expedition 1838-42, v. 5) -- Manila in 1819, by Lieut. John White (from the "History of a voyage to the China Sea") -- The peopling of the Philippines, by Doctor Rudolf Virchow (O. T. Mason's translation; Smithsonian institution 1899 report) -- People and prospects of the Philippines, by an English merchant, 1778, and a consul, 1878 (from Blackwood's and the Cornhill magazine) -- Filipino merchants of the early 1890s, by F. Karuth. | Craig, Austin, 1872- [Editor] | | 2004-01-01 |