Davis, W W. H. 1820-1910 History of Doylestown, old and new. From its Settlement to the Close of the Nineteenth Century, 1745-1900

Walworth, Clarence A. 1820-1900 Walworths of America; Comprising Five Chapters of Family History, With Additional Chapters of Genealogy

Minibok: Julen i Skåne på 1820-talet, E-bok

Porter, Theodore M. The Rise of Statistical Thinking, 1820-1900

Richards, T Addison 1820-1900 Miller's Guide to Saratoga Springs and Vicinity; Volume 2