| title | creator | language | description | tableOfContents | contributor | subject | created |
| An Architect's Note-Book in Spain
principally illustrating the domestic architecture of that country. | Wyatt, Matthew Digby, 1820-1877 | en | | | | | 2010-09-30 |
| Essays on Various Subjects
Principally Designed for Young Ladies | More, Hannah, 1745-1833 | en | | | | | 2006-10-21 |
| A History of England Principally in the Seventeenth Century, Volume I (of 6) | Ranke, Leopold von, 1795-1886 | en | | | | Great Britain -- History -- Stuarts, 1603-1714; England -- Civilization -- 17th century | 2009-04-09 |
| On the Execution of Music, and Principally of Ancient Music | Saint-Saëns, Camille, 1835-1921 | en | | | Bowie, Henry P. [Translator] | Music appreciation; Gregorian chants -- History and criticism | 2009-11-07 |