Encyclopedias, Almanacs, Transcripts, and Maps
- The Age of Progress
- The Agricultural Sciences Flourish and Contribute to the Growing Size, Health, and Wealth of Western Nations
- The AIDS Pandemic
- The Alchemy of Mineral Acids
- The Algebraization of Analysis
- The Alliance of Science and Art in Early Modern Europe
- The Amityville Horror
- The Ancestral Puebloans and the Cliff Palaces at Mesa Verde
- The Appearance of Syphilis in the 1490s
- The Aquarian Conspiracy
- The Arab-Persian Trading Cities of East Africa
- The Art and Science of Falconry
- The Ashtabula Poltergeist
- The ASPR
- The Assassins
- The Awakener (Magazine)
- The Baha'i Faith
- The Barbanell Report
- The Battle against Tuberculosis: Robert Koch, the Development of TB Sanitariums, and the Enactment of Public Health Measures
- The Bawa Muhaiyaddeen Fellowship