Encyclopedias, Almanacs, Transcripts, and Maps
- Nikolai Nikolaevich Luzin
- Nikolaus August Otto
- Nikolaus Bernoulli
- Nikolaus Federmann
- Nikolay Mikhaylovich Przhevalsky
- Nikolay Przhevalsky and Russian Expansion: The Exploration of Central and East Asia
- Nils A. E. Nordenskiöld Discovers the Northeast Passage
- Nina Karlovna Bari
- Nineteenth-Century Advances in the Mathematical Theory and Understanding of Sound
- Nineteenth-Century Advances in Understanding Gases, Culminating in William Ramsey's Discovery of Inert Gases in the 1890s
- Nineteenth-Century Biological Theories on Race
- Nineteenth-Century Development of the Concept of Energy
- Nineteenth-Century Developments in Measuring the Locations and Distances of Celestial Bodies
- Nineteenth-Century Developments Related to Sight and the Eye
- Nineteenth-Century Efforts to Catalog Stars
- Nineteenth-Century Efforts to Promote Mathematics Education from Grade School to the University Level
- Nineteenth-century Views of the Female Body and Their Impact on Women in Society
- Ninety-Five Percent of Americans Believe in God
- Nirmala Devi Srivastava (1923-)
- Nitrogen Cycle in Microorganisms